Android: Makes SelectionPopupController init simpler

Embedders have to do a bit convoluted initialization for
SelectionPopupController (its action mode callback to be set
requires a helper instance from the SPC itself). This CL makes
it simpler by delegating the helper initialization to
action mode callback constructor.

|ceateContentViewCore| in Tab.java, For instance:

From:
SelectionPopupController controller = SelectionPopupController.fromWebContents(webContents);
ChromeActionModeCallback actionModeCallback =
    new ChromeActionModeCallback(this, controller.getActionModeCallbackHelper());
controller.setActionModeCallback(actionModeCallback);

SelectionPopupController.fromWebContents(webContents)
    setActionModeCallback(new ChromeActionModeCallback(this, webContents));

to: 
Change-Id: Ifec52ce2c1f9446f47de72295be1abc5e1c361d7
Reviewed-on: https://chromium-review.googlesource.com/1029757
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556037}

android_webview/java/src/org/chromium/android_webview/AwActionModeCallback.java

@@ -17,6 +17,8 @@ import android.view.MenuItem;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.content.R;
 import org.chromium.content_public.browser.ActionModeCallbackHelper;
+import org.chromium.content_public.browser.SelectionPopupController;
+import org.chromium.content_public.browser.WebContents;
 
 /**
  * A class that handles selection action mode for Android WebView.
@@ -27,11 +29,11 @@ public class AwActionModeCallback implements ActionMode.Callback {
     private final ActionModeCallbackHelper mHelper;
     private int mAllowedMenuItems;
 
-    public AwActionModeCallback(Context context, AwContents awContents,
-            ActionModeCallbackHelper helper) {
+    public AwActionModeCallback(Context context, AwContents awContents, WebContents webContents) {
         mContext = context;
         mAwContents = awContents;
-        mHelper = helper;
+        mHelper =
+                SelectionPopupController.fromWebContents(webContents).getActionModeCallbackHelper();
         mHelper.setAllowedMenuItems(0);  // No item is allowed by default for WebView.
     }
 

android_webview/java/src/org/chromium/android_webview/AwContents.java

@@ -875,8 +875,7 @@ public class AwContents implements SmartClipProvider {
                 viewDelegate, internalDispatcher, windowAndroid);
         mContentViewCore.setHideKeyboardOnBlur(false);
         SelectionPopupController controller = SelectionPopupController.fromWebContents(webContents);
-        controller.setActionModeCallback(
-                new AwActionModeCallback(mContext, this, controller.getActionModeCallbackHelper()));
+        controller.setActionModeCallback(new AwActionModeCallback(mContext, this, webContents));
         if (mAutofillProvider != null) {
             controller.setNonSelectionActionModeCallback(
                     new AutofillActionModeCallback(mContext, mAutofillProvider));

chrome/android/java/src/org/chromium/chrome/browser/ChromeActionModeCallback.java

@@ -23,6 +23,8 @@ import org.chromium.components.feature_engagement.EventConstants;
 import org.chromium.content.R;
 import org.chromium.content_public.browser.ActionModeCallbackHelper;
 import org.chromium.content_public.browser.LoadUrlParams;
+import org.chromium.content_public.browser.SelectionPopupController;
+import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.base.PageTransition;
 
 /**
@@ -32,9 +34,14 @@ public class ChromeActionModeCallback implements ActionMode.Callback {
     private final Tab mTab;
     private final ActionModeCallbackHelper mHelper;
 
-    public ChromeActionModeCallback(Tab tab, ActionModeCallbackHelper helper) {
+    public ChromeActionModeCallback(Tab tab, WebContents webContents) {
         mTab = tab;
-        mHelper = helper;
+        mHelper = getActionModeCallbackHelper(webContents);
+    }
+
+    @VisibleForTesting
+    protected ActionModeCallbackHelper getActionModeCallbackHelper(WebContents webContents) {
+        return SelectionPopupController.fromWebContents(webContents).getActionModeCallbackHelper();
     }
 
     @Override

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

@@ -1795,10 +1795,8 @@ public class Tab
                 R.string.accessibility_content_view));
         ContentViewCore cvc = ContentViewCore.create(mThemedApplicationContext, PRODUCT_VERSION,
                 webContents, new TabViewAndroidDelegate(this, cv), cv, getWindowAndroid());
-        SelectionPopupController controller = SelectionPopupController.fromWebContents(webContents);
-        ChromeActionModeCallback actionModeCallback =
-                new ChromeActionModeCallback(this, controller.getActionModeCallbackHelper());
-        controller.setActionModeCallback(actionModeCallback);
+        SelectionPopupController.fromWebContents(webContents)
+                .setActionModeCallback(new ChromeActionModeCallback(this, webContents));
         return cvc;
     }
 

chrome/android/junit/src/org/chromium/chrome/browser/ChromeActionModeCallbackTest.java

@@ -28,6 +28,7 @@ import org.chromium.chrome.browser.locale.LocaleManager;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.content.R;
 import org.chromium.content_public.browser.ActionModeCallbackHelper;
+import org.chromium.content_public.browser.WebContents;
 import org.chromium.testing.local.LocalRobolectricTestRunner;
 
 /**
@@ -45,7 +46,18 @@ public class ChromeActionModeCallbackTest {
     @Mock
     private Menu mMenu;
 
-    private ChromeActionModeCallback mActionModeCallback;
+    private class TestChromeActionModeCallback extends ChromeActionModeCallback {
+        public TestChromeActionModeCallback(Tab tab, ActionModeCallbackHelper helper) {
+            super(tab, null);
+        }
+
+        @Override
+        public ActionModeCallbackHelper getActionModeCallbackHelper(WebContents webContents) {
+            return mActionModeCallbackHelper;
+        }
+    }
+
+    private TestChromeActionModeCallback mActionModeCallback;
 
     @Before
     public void setUp() throws Exception {
@@ -55,7 +67,7 @@ public class ChromeActionModeCallbackTest {
         RecordUserAction.setDisabledForTests(true);
 
         mActionModeCallback =
-                Mockito.spy(new ChromeActionModeCallback(mTab, mActionModeCallbackHelper));
+                Mockito.spy(new TestChromeActionModeCallback(mTab, mActionModeCallbackHelper));
     }
 
     @After

content/shell/android/java/src/org/chromium/content_shell/Shell.java

@@ -306,8 +306,8 @@ public class Shell extends LinearLayout {
         mContentViewCore = (ContentViewCoreImpl) ContentViewCore.create(
                 context, "", webContents, mViewAndroidDelegate, cv, mWindow);
         mWebContents = webContents;
-        SelectionPopupController controller = SelectionPopupController.fromWebContents(webContents);
-        controller.setActionModeCallback(defaultActionCallback());
+        SelectionPopupController.fromWebContents(webContents)
+                .setActionModeCallback(defaultActionCallback());
         mNavigationController = mWebContents.getNavigationController();
         if (getParent() != null) mWebContents.onShow();
         if (mWebContents.getVisibleUrl() != null) {