Adding compositor callbacks to RenderWidgetHostViewAndroid

The coupling between the compositor and the RenderWidgetHostViewAndroid (RWHVA)
is weak.  This causes problem such as when RWHVA needs to act on a compositor
commit (as in the current DidCommitFrameData callback).

We create a WindowAndroidObserver class and add a list of observers to the
android window, which then forwards the callbacks from the compositor to the
observers.  

android= https://gerrit-int.chromium.org/#/c/44978/

BUG=273250

Review URL: https://codereview.chromium.org/26753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@236598 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 10 insertions, 8 deletions

diff --git a/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java b/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
index a7e3037..c112ede 100644
--- a/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
+++ b/content/shell/android/java/src/org/chromium/content_shell/ShellManager.java
@@ -37,7 +37,15 @@ public class ShellManager extends FrameLayout {
     public ShellManager(Context context, AttributeSet attrs) {
         super(context, attrs);
         nativeInit(this);
-        mContentViewRenderView = new ContentViewRenderView(context) {
+    }
+
+    /**
+     * @param window The window used to generate all shells.
+     */
+    public void setWindow(WindowAndroid window) {
+        assert window != null;
+        mWindow = window;
+        mContentViewRenderView = new ContentViewRenderView(getContext(), window) {
             @Override
             protected void onReadyToRender() {
                 if (sStartup) {
@@ -49,13 +57,6 @@ public class ShellManager extends FrameLayout {
     }
 
     /**
-     * @param window The window used to generate all shells.
-     */
-    public void setWindow(WindowAndroid window) {
-        mWindow = window;
-    }
-
-    /**
      * @return The window used to generate all shells.
      */
     public WindowAndroid getWindow() {
@@ -87,6 +88,7 @@ public class ShellManager extends FrameLayout {
     @SuppressWarnings("unused")
     @CalledByNative
     private Object createShell() {
+        assert mContentViewRenderView != null;
         LayoutInflater inflater =
                 (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         Shell shellView = (Shell) inflater.inflate(R.layout.shell_view, null);