Win8 Aura :add suport for changing cursors

To change the cursor we need to send a message from
the browser to the viewer with the right HCURSOR. Since the
cursors are a GDI shared resource, we can call ::LoadCursor
in the browser and ::SetCursor in the viewer.

BUG=151718
TEST= moving pointer to a chrome window edge changes cursor to resize cursor
Review URL: https://codereview.chromium.org/11446078

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@172265 0039d316-1c4b-4281-b951-d872f2087c98

ui/aura/remote_root_window_host_win.cc

@@ -121,6 +121,10 @@ gfx::Point RemoteRootWindowHostWin::GetLocationOnNativeScreen() const {
 }
 
 void RemoteRootWindowHostWin::SetCursor(gfx::NativeCursor native_cursor) {
+  if (!host_)
+    return;
+  host_->Send(
+      new MetroViewerHostMsg_SetCursor(uint64(native_cursor.platform())));
 }
 
 void RemoteRootWindowHostWin::SetCapture() {

ui/metro_viewer/metro_viewer_messages.h

@@ -14,7 +14,7 @@
 IPC_ENUM_TRAITS(ui::EventType)
 IPC_ENUM_TRAITS(ui::EventFlags)
 
-// Messages sent from the viewer to the browser.
+// Messages sent from the viewer to the browser:
 
 // Inform the browser of the surface to target for compositing.
 IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_SetTargetSurface,
@@ -51,6 +51,7 @@ IPC_MESSAGE_CONTROL4(MetroViewerHostMsg_Character,
 // Informs the browser that the visibiliy of the viewer has changed.
 IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_VisibilityChanged,
                      bool          /* visible */);
+
 IPC_MESSAGE_CONTROL3(MetroViewerHostMsg_TouchDown,
                      int32,           /* x-coordinate */
                      int32,           /* y-coordinate */
@@ -63,3 +64,9 @@ IPC_MESSAGE_CONTROL3(MetroViewerHostMsg_TouchMoved,
                      int32,           /* x-coordinate */
                      int32,           /* y-coordinate */
                      uint64)          /* timestamp */
+
+// Messages sent from the browser to the viewer:
+
+// Requests the viewer to change the pointer to a new cursor.
+IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_SetCursor,
+                     int64         /* cursor */);

win8/metro_driver/chrome_app_view_ash.cc

@@ -66,8 +66,16 @@ void MetroExit() {
 
 class ChromeChannelListener : public IPC::Listener {
  public:
+  ChromeChannelListener(MessageLoop* ui_loop, ChromeAppViewAsh* app_view)
+      : ui_proxy_(ui_loop->message_loop_proxy()),
+        app_view_(app_view) {
+  }
+
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
-    DVLOG(1) << "Received ipc message " << message.type();
+    IPC_BEGIN_MESSAGE_MAP(ChromeChannelListener, message)
+      IPC_MESSAGE_HANDLER(MetroViewerHostMsg_SetCursor, OnSetCursor)
+      IPC_MESSAGE_UNHANDLED(__debugbreak())
+    IPC_END_MESSAGE_MAP()
     return true;
   }
 
@@ -75,6 +83,17 @@ class ChromeChannelListener : public IPC::Listener {
     DVLOG(1) << "Channel error";
     MetroExit();
   }
+
+ private:
+   void OnSetCursor(int64 cursor) {
+     ui_proxy_->PostTask(FROM_HERE,
+                         base::Bind(&ChromeAppViewAsh::OnSetCursor,
+                                    base::Unretained(app_view_),
+                                    reinterpret_cast<HCURSOR>(cursor)));
+   }
+
+   scoped_refptr<base::MessageLoopProxy> ui_proxy_;
+   ChromeAppViewAsh* app_view_;
 };
 
 bool WaitForChromeIPCConnection(const std::string& channel_name) {
@@ -328,7 +347,7 @@ ChromeAppViewAsh::Run() {
 
   // In Aura mode we create an IPC channel to the browser, then ask it to
   // connect to us.
-  ChromeChannelListener ui_channel_listener;
+  ChromeChannelListener ui_channel_listener(&msg_loop, this);
   IPC::ChannelProxy ui_channel(ipc_channel_name,
                                IPC::Channel::MODE_NAMED_CLIENT,
                                &ui_channel_listener,
@@ -355,6 +374,10 @@ ChromeAppViewAsh::Uninitialize() {
   return S_OK;
 }
 
+void ChromeAppViewAsh::OnSetCursor(HCURSOR cursor) {
+  ::SetCursor(HCURSOR(cursor));
+}
+
 HRESULT ChromeAppViewAsh::OnActivate(
     winapp::Core::ICoreApplicationView*,
     winapp::Activation::IActivatedEventArgs* args) {

win8/metro_driver/chrome_app_view_ash.h

@@ -32,6 +32,8 @@ class ChromeAppViewAsh
   IFACEMETHOD(Run)();
   IFACEMETHOD(Uninitialize)();
 
+  void OnSetCursor(HCURSOR cursor);
+
  private:
   HRESULT OnActivate(winapp::Core::ICoreApplicationView* view,
                      winapp::Activation::IActivatedEventArgs* args);