Context menus should appear above the touch point if invoked by long press.

This CL does this for content area context menus only. I will send out another CL for same functionality on views controls.
We acheive this as follows: We remember in render_widget_host, which kind of
event is currently in process. When we get a request for showing context menu,
in render_view_host, we check if currently we are processing a gesture event,
and if so, we display the context menu appropriately.

BUG=142015
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/10917102

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@155306 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/android/tab_contents/chrome_web_contents_view_delegate_android.cc

@@ -26,7 +26,8 @@ ChromeWebContentsViewDelegateAndroid::GetDragDestDelegate() {
 }
 
 void ChromeWebContentsViewDelegateAndroid::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   // http://crbug.com/136075
   NOTIMPLEMENTED();
   // Still lacking some code here that depends on

chrome/browser/ui/android/tab_contents/chrome_web_contents_view_delegate_android.h

@@ -24,7 +24,8 @@ class ChromeWebContentsViewDelegateAndroid
 
   // WebContentsViewDelegate:
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
 
   // WebContentsViewDelegate:
   virtual content::WebDragDestDelegate* GetDragDestDelegate() OVERRIDE;

chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.h

@@ -32,7 +32,8 @@ class ChromeWebContentsViewDelegateMac
           content::RenderWidgetHost* render_widget_host) OVERRIDE;
   virtual content::WebDragDestDelegate* GetDragDestDelegate() OVERRIDE;
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
 
  private:
   // The context menu. Callbacks are asynchronous so we need to keep it around.

chrome/browser/ui/cocoa/tab_contents/chrome_web_contents_view_delegate_mac.mm

@@ -33,7 +33,8 @@ content::WebDragDestDelegate*
 }
 
 void ChromeWebContentsViewDelegateMac::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   // The renderer may send the "show context menu" message multiple times, one
   // for each right click mouse event it receives. Normally, this doesn't happen
   // because mouse events are not forwarded once the context menu is showing.

chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.cc

@@ -116,7 +116,8 @@ gboolean ChromeWebContentsViewDelegateGtk::OnNativeViewFocusEvent(
 }
 
 void ChromeWebContentsViewDelegateGtk::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   // Find out the RenderWidgetHostView that corresponds to the render widget on
   // which this context menu is showed, so that we can retrieve the last mouse
   // down event on the render widget and use it as the timestamp of the

chrome/browser/ui/gtk/tab_contents/chrome_web_contents_view_delegate_gtk.h

@@ -40,7 +40,8 @@ class ChromeWebContentsViewDelegateGtk
 
   // Overridden from WebContentsViewDelegate:
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual content::WebDragDestDelegate* GetDragDestDelegate() OVERRIDE;
   virtual void Initialize(GtkWidget* expanded_container,
                           ui::FocusStoreGtk* focus_store) OVERRIDE;

chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.cc

@@ -123,7 +123,8 @@ void ChromeWebContentsViewDelegateViews::RestoreFocus() {
 }
 
 void ChromeWebContentsViewDelegateViews::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   context_menu_.reset(
       RenderViewContextMenuViews::Create(web_contents_, params));
   context_menu_->Init();
@@ -152,7 +153,7 @@ void ChromeWebContentsViewDelegateViews::ShowContextMenu(
   // Enable recursive tasks on the message loop so we can get updates while
   // the context menu is being displayed.
   MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
-  context_menu_->RunMenuAt(GetTopLevelWidget(), screen_point);
+  context_menu_->RunMenuAt(GetTopLevelWidget(), screen_point, type);
 }
 
 void ChromeWebContentsViewDelegateViews::SizeChanged(const gfx::Size& size) {

chrome/browser/ui/views/tab_contents/chrome_web_contents_view_delegate_views.h

@@ -39,7 +39,8 @@ class ChromeWebContentsViewDelegateViews
   virtual bool Focus() OVERRIDE;
   virtual void TakeFocus(bool reverse) OVERRIDE;
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void SizeChanged(const gfx::Size& size) OVERRIDE;
 
  private:

chrome/browser/ui/views/tab_contents/render_view_context_menu_views.cc

@@ -42,10 +42,15 @@ RenderViewContextMenuViews* RenderViewContextMenuViews::Create(
 }
 #endif  // OS_WIN
 
-void RenderViewContextMenuViews::RunMenuAt(views::Widget* parent,
-                                           const gfx::Point& point) {
+void RenderViewContextMenuViews::RunMenuAt(
+    views::Widget* parent,
+    const gfx::Point& point,
+    const content::ContextMenuSourceType& type) {
+  views::MenuItemView::AnchorPosition anchor_position =
+      type == content::CONTEXT_MENU_SOURCE_TOUCH ?
+          views::MenuItemView::BOTTOMCENTER : views::MenuItemView::TOPLEFT;
   if (menu_runner_->RunMenuAt(parent, NULL, gfx::Rect(point, gfx::Size()),
-          views::MenuItemView::TOPLEFT, views::MenuRunner::HAS_MNEMONICS |
+      anchor_position, views::MenuRunner::HAS_MNEMONICS |
           views::MenuRunner::CONTEXT_MENU) ==
       views::MenuRunner::MENU_DELETED)
     return;

chrome/browser/ui/views/tab_contents/render_view_context_menu_views.h

@@ -9,6 +9,7 @@
 #include "base/memory/scoped_vector.h"
 #include "base/string16.h"
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
+#include "content/public/common/context_menu_source_type.h"
 
 namespace gfx {
 class Point;
@@ -30,7 +31,9 @@ class RenderViewContextMenuViews : public RenderViewContextMenu {
       content::WebContents* tab_contents,
       const content::ContextMenuParams& params);
 
-  void RunMenuAt(views::Widget* parent, const gfx::Point& point);
+  void RunMenuAt(views::Widget* parent,
+                 const gfx::Point& point,
+                 const content::ContextMenuSourceType& type);
 
   void UpdateMenuItemStates();
 

content/browser/renderer_host/render_view_host_delegate.h

@@ -13,6 +13,7 @@
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "content/common/content_export.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "content/public/common/javascript_message_type.h"
 #include "content/public/common/media_stream_request.h"
 #include "net/base/load_states.h"
@@ -404,7 +405,8 @@ class CONTENT_EXPORT RenderViewHostDelegate {
 
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
-  virtual void ShowContextMenu(const ContextMenuParams& params) {}
+  virtual void ShowContextMenu(const ContextMenuParams& params,
+                               const ContextMenuSourceType& type) {}
 
   // The render view has requested access to media devices listed in
   // |request|, and the client should grant or deny that permission by

content/browser/renderer_host/render_view_host_impl.cc

@@ -53,6 +53,7 @@
 #include "content/public/common/content_constants.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/context_menu_params.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "content/public/common/result_codes.h"
 #include "content/public/common/url_constants.h"
 #include "net/base/net_util.h"
@@ -1253,7 +1254,15 @@ void RenderViewHostImpl::OnMsgContextMenu(
   FilterURL(policy, renderer_id, false, &validated_params.page_url);
   FilterURL(policy, renderer_id, true, &validated_params.frame_url);
 
-  delegate_->ShowContextMenu(validated_params);
+  content::ContextMenuSourceType type = content::CONTEXT_MENU_SOURCE_MOUSE;
+  if (!in_process_event_types_.empty()) {
+    WebKit::WebInputEvent::Type event_type = in_process_event_types_.front();
+    if (WebKit::WebInputEvent::isGestureEventType(event_type))
+      type = content::CONTEXT_MENU_SOURCE_TOUCH;
+    else if (WebKit::WebInputEvent::isKeyboardEventType(event_type))
+      type = content::CONTEXT_MENU_SOURCE_KEYBOARD;
+  }
+  delegate_->ShowContextMenu(validated_params, type);
 }
 
 void RenderViewHostImpl::OnMsgToggleFullscreen(bool enter_fullscreen) {

content/browser/renderer_host/render_view_host_unittest.cc

@@ -83,7 +83,8 @@ class MockDraggingRenderViewHostDelegateView
  public:
   virtual ~MockDraggingRenderViewHostDelegateView() {}
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE {}
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE {}
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/browser/renderer_host/render_widget_host_impl.cc

@@ -1016,6 +1016,8 @@ void RenderWidgetHostImpl::ForwardInputEvent(const WebInputEvent& input_event,
 
   DCHECK(!process_->IgnoreInputEvents());
 
+  in_process_event_types_.push(input_event.type);
+
   IPC::Message* message = new ViewMsg_HandleInputEvent(routing_id_);
   message->WriteData(
       reinterpret_cast<const char*>(&input_event), event_size);
@@ -1534,6 +1536,9 @@ void RenderWidgetHostImpl::DidUpdateBackingStore(
 void RenderWidgetHostImpl::OnMsgInputEventAck(WebInputEvent::Type event_type,
                                               bool processed) {
   TRACE_EVENT0("renderer_host", "RenderWidgetHostImpl::OnMsgInputEventAck");
+  if (!in_process_event_types_.empty() &&
+      in_process_event_types_.front() == event_type)
+    in_process_event_types_.pop();
 
   // Log the time delta for processing an input event.
   TimeDelta delta = TimeTicks::Now() - input_event_start_time_;

content/browser/renderer_host/render_widget_host_impl.h

@@ -7,6 +7,7 @@
 
 #include <deque>
 #include <map>
+#include <queue>
 #include <string>
 #include <vector>
 
@@ -490,6 +491,8 @@ class CONTENT_EXPORT RenderWidgetHostImpl : virtual public RenderWidgetHost,
   // This value indicates how long to wait before we consider a renderer hung.
   int hung_renderer_delay_ms_;
 
+  std::queue<WebKit::WebInputEvent::Type> in_process_event_types_;
+
  private:
   friend class ::MockRenderWidgetHost;
 

content/browser/web_contents/interstitial_page_impl.cc

@@ -675,7 +675,8 @@ void InterstitialPageImpl::ShowCreatedFullscreenWidget(int route_id) {
 }
 
 void InterstitialPageImpl::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
 }
 
 void InterstitialPageImpl::Disable() {

content/browser/web_contents/interstitial_page_impl.h

@@ -113,7 +113,8 @@ class CONTENT_EXPORT InterstitialPageImpl
                                  const gfx::Rect& initial_pos) OVERRIDE;
   virtual void ShowCreatedFullscreenWidget(int route_id) OVERRIDE;
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
 
   // RenderWidgetHostDelegate implementation:
   virtual bool PreHandleKeyboardEvent(

content/browser/web_contents/web_contents_impl.cc

@@ -1425,12 +1425,13 @@ RenderWidgetHostView* WebContentsImpl::GetCreatedWidget(int route_id) {
 }
 
 void WebContentsImpl::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   // Allow WebContentsDelegates to handle the context menu operation first.
   if (delegate_ && delegate_->HandleContextMenu(params))
     return;
 
-  render_view_host_delegate_view_->ShowContextMenu(params);
+  render_view_host_delegate_view_->ShowContextMenu(params, type);
 }
 
 void WebContentsImpl::RequestMediaAccessPermission(

content/browser/web_contents/web_contents_impl.h

@@ -406,7 +406,8 @@ class CONTENT_EXPORT WebContentsImpl
                                  const gfx::Rect& initial_pos) OVERRIDE;
   virtual void ShowCreatedFullscreenWidget(int route_id) OVERRIDE;
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void RequestMediaAccessPermission(
       const content::MediaStreamRequest* request,
       const content::MediaResponseCallback& callback) OVERRIDE;

content/browser/web_contents/web_contents_view_android.cc

@@ -158,9 +158,11 @@ gfx::Rect WebContentsViewAndroid::GetViewBounds() const {
     return gfx::Rect();
 }
 
-void WebContentsViewAndroid::ShowContextMenu(const ContextMenuParams& params) {
+void WebContentsViewAndroid::ShowContextMenu(
+    const ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
 }
 
 void WebContentsViewAndroid::ShowPopupMenu(

content/browser/web_contents/web_contents_view_android.h

@@ -54,7 +54,9 @@ class WebContentsViewAndroid : public WebContentsView,
   virtual gfx::Rect GetViewBounds() const OVERRIDE;
 
   // Backend implementation of RenderViewHostDelegateView.
-  virtual void ShowContextMenu(const ContextMenuParams& params) OVERRIDE;
+  virtual void ShowContextMenu(
+      const ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/browser/web_contents/web_contents_view_aura.cc

@@ -405,9 +405,10 @@ gfx::Rect WebContentsViewAura::GetViewBounds() const {
 // WebContentsViewAura, RenderViewHostDelegateView implementation:
 
 void WebContentsViewAura::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
 }
 
 void WebContentsViewAura::ShowPopupMenu(const gfx::Rect& bounds,

content/browser/web_contents/web_contents_view_aura.h

@@ -72,7 +72,8 @@ class CONTENT_EXPORT WebContentsViewAura
 
   // Overridden from RenderViewHostDelegateView:
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/browser/web_contents/web_contents_view_gtk.cc

@@ -328,9 +328,10 @@ gboolean WebContentsViewGtk::OnFocus(GtkWidget* widget,
 }
 
 void WebContentsViewGtk::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
   else
     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 }

content/browser/web_contents/web_contents_view_gtk.h

@@ -71,7 +71,8 @@ class CONTENT_EXPORT WebContentsViewGtk
 
   // Backend implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/browser/web_contents/web_contents_view_mac.h

@@ -87,7 +87,8 @@ class WebContentsViewMac
 
   // Backend implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/browser/web_contents/web_contents_view_mac.mm

@@ -281,7 +281,8 @@ void WebContentsViewMac::TakeFocus(bool reverse) {
 }
 
 void WebContentsViewMac::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   // Allow delegates to handle the context menu operation first.
   if (web_contents_->GetDelegate() &&
       web_contents_->GetDelegate()->HandleContextMenu(params)) {
@@ -289,7 +290,7 @@ void WebContentsViewMac::ShowContextMenu(
   }
 
   if (delegate())
-    delegate()->ShowContextMenu(params);
+    delegate()->ShowContextMenu(params, type);
   else
     DLOG(ERROR) << "Cannot show context menus without a delegate.";
 }

content/browser/web_contents/web_contents_view_win.cc

@@ -264,9 +264,10 @@ gfx::Rect WebContentsViewWin::GetViewBounds() const {
 }
 
 void WebContentsViewWin::ShowContextMenu(
-    const content::ContextMenuParams& params) {
+    const content::ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
   if (delegate_.get())
-    delegate_->ShowContextMenu(params);
+    delegate_->ShowContextMenu(params, type);
 }
 
 void WebContentsViewWin::ShowPopupMenu(const gfx::Rect& bounds,

content/browser/web_contents/web_contents_view_win.h

@@ -80,7 +80,8 @@ class CONTENT_EXPORT WebContentsViewWin
 
   // Implementation of RenderViewHostDelegateView.
   virtual void ShowContextMenu(
-      const content::ContextMenuParams& params) OVERRIDE;
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

content/content_common.gypi

@@ -47,6 +47,7 @@
     'public/common/content_switches.h',
     'public/common/context_menu_params.cc',
     'public/common/context_menu_params.h',
+    'public/common/context_menu_source_type.h',
     'public/common/console_message_level.h',
     'public/common/dx_diag_node.cc',
     'public/common/dx_diag_node.h',

content/port/browser/render_view_host_delegate_view.h

@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 
 class SkBitmap;
@@ -32,7 +33,8 @@ class CONTENT_EXPORT RenderViewHostDelegateView {
  public:
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
-  virtual void ShowContextMenu(const ContextMenuParams& params) {}
+  virtual void ShowContextMenu(const ContextMenuParams& params,
+                               const ContextMenuSourceType& type) {}
 
   // Shows a popup menu with the specified items.
   // This method should call RenderViewHost::DidSelectPopupMenuItem[s]() or

content/public/browser/web_contents_view_delegate.h

@@ -12,6 +12,7 @@
 #endif
 
 #include "content/common/content_export.h"
+#include "content/public/common/context_menu_source_type.h"
 #include "ui/gfx/native_widget_types.h"
 
 #if defined(OS_MACOSX)
@@ -42,7 +43,9 @@ class CONTENT_EXPORT WebContentsViewDelegate {
   virtual WebDragDestDelegate* GetDragDestDelegate() = 0;
 
   // Shows a context menu.
-  virtual void ShowContextMenu(const content::ContextMenuParams& params) = 0;
+  virtual void ShowContextMenu(
+      const content::ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) = 0;
 
 #if defined(OS_WIN) || defined(USE_AURA)
   // These methods allow the embedder to intercept WebContentsViewWin's

content/public/common/context_menu_source_type.h

@@ -0,0 +1,18 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_PUBLIC_COMMON_CONTEXT_MENU_SOURCE_TYPE_H_
+#define CONTENT_PUBLIC_COMMON_CONTEXT_MENU_SOURCE_TYPE_H_
+
+namespace content {
+
+enum ContextMenuSourceType {
+  CONTEXT_MENU_SOURCE_MOUSE,
+  CONTEXT_MENU_SOURCE_KEYBOARD,
+  CONTEXT_MENU_SOURCE_TOUCH,
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_COMMON_CONTEXT_MENU_SOURCE_TYPE_H_

content/shell/shell_web_contents_view_delegate.h

@@ -8,6 +8,7 @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view_delegate.h"
 #include "content/public/common/context_menu_params.h"
+#include "content/public/common/context_menu_source_type.h"
 
 #if defined(TOOLKIT_GTK)
 #include "ui/base/gtk/gtk_signal.h"
@@ -22,8 +23,8 @@ class ShellWebContentsViewDelegate : public WebContentsViewDelegate {
   virtual ~ShellWebContentsViewDelegate();
 
   // Overridden from WebContentsViewDelegate:
-  virtual void ShowContextMenu(
-      const ContextMenuParams& params) OVERRIDE;
+  virtual void ShowContextMenu(const ContextMenuParams& params,
+                               const ContextMenuSourceType& type) OVERRIDE;
   virtual WebDragDestDelegate* GetDragDestDelegate() OVERRIDE;
 
 #if defined(TOOLKIT_GTK)

content/shell/shell_web_contents_view_delegate_gtk.cc

@@ -41,7 +41,8 @@ ShellWebContentsViewDelegate::~ShellWebContentsViewDelegate() {
 }
 
 void ShellWebContentsViewDelegate::ShowContextMenu(
-    const ContextMenuParams& params) {
+    const ContextMenuParams& params,
+    const ContextMenuSourceType& type) {
   GtkWidget* menu = gtk_menu_new();
 
   params_ = params;

content/test/test_web_contents_view.cc

@@ -13,7 +13,8 @@ TestWebContentsView::~TestWebContentsView() {
 }
 
 void TestWebContentsView::ShowContextMenu(
-    const ContextMenuParams& params) {
+    const ContextMenuParams& params,
+    const content::ContextMenuSourceType& type) {
 }
 
 void TestWebContentsView::ShowPopupMenu(const gfx::Rect& bounds,

content/test/test_web_contents_view.h

@@ -18,7 +18,9 @@ class TestWebContentsView : public WebContentsView,
   virtual ~TestWebContentsView();
 
   // RenderViewHostDelegateView:
-  virtual void ShowContextMenu(const ContextMenuParams& params) OVERRIDE;
+  virtual void ShowContextMenu(
+      const ContextMenuParams& params,
+      const content::ContextMenuSourceType& type) OVERRIDE;
   virtual void ShowPopupMenu(const gfx::Rect& bounds,
                              int item_height,
                              double item_font_size,

ui/views/controls/menu/menu_controller.cc

@@ -1564,6 +1564,9 @@ gfx::Rect MenuController::CalculateMenuBounds(MenuItemView* item,
       x = x + state_.initial_bounds.width() - pref.width();
       if (MenuConfig::instance().offset_context_menus && state_.context_menu)
         x -= 1;
+    } else if (state_.anchor == MenuItemView::BOTTOMCENTER) {
+      x = x - (pref.width() - state_.initial_bounds.width()) / 2;
+      y = std::max(0, state_.initial_bounds.y() - pref.height());
     }
 
     if (!state_.monitor_bounds.IsEmpty() &&

ui/views/controls/menu/menu_item_view.h

@@ -91,7 +91,8 @@ class VIEWS_EXPORT MenuItemView : public View {
   // opposite position will be used if base::i18n:IsRTL() is true.
   enum AnchorPosition {
     TOPLEFT,
-    TOPRIGHT
+    TOPRIGHT,
+    BOTTOMCENTER
   };
 
   // Where the menu should be drawn, above or below the bounds (when