Introduce ViewRoot forwarding input/view events to native

content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
index 80b3593f3b1d798dce4770b6e686a07776b7ebf5..24cb72a529e1df09bf0d9d2904fb70e9d7c9c898 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java
@@ -20,8 +20,8 @@ import org.chromium.ui.base.WindowAndroid;
 
 /***
  * This view is used by a ContentView to render its content.
- * Call {@link #setCurrentContentViewCore(ContentViewCore)} with the contentViewCore that should be
- * managing the view.
+ * Call {@link #setCurrentContent(ContentViewCore, ViewRoot)} to associate this class
+ * with the content to be rendered.
  * Note that only one ContentViewCore can be shown at a time.
  */
 @JNINamespace("content")
@@ -32,6 +32,7 @@ public class ContentViewRenderView extends FrameLayout {
 
     private final SurfaceView mSurfaceView;
     protected ContentViewCore mContentViewCore;
+    private ViewRoot mViewRoot;
 
     /**
      * Constructs a new ContentViewRenderView.
@@ -71,8 +72,8 @@ public class ContentViewRenderView extends FrameLayout {
                 assert mNativeContentViewRenderView != 0;
                 nativeSurfaceChanged(mNativeContentViewRenderView,
                         format, width, height, holder.getSurface());
-                if (mContentViewCore != null) {
-                    getViewRoot().onPhysicalBackingSizeChanged(width, height);
+                if (mViewRoot != null) {
+                    mViewRoot.onPhysicalBackingSizeChanged(width, height);
                 }
             }
 
@@ -94,10 +95,6 @@ public class ContentViewRenderView extends FrameLayout {
         mSurfaceView.setVisibility(VISIBLE);
     }
 
-    private ViewRoot getViewRoot() {
-        return mContentViewCore.getWindowAndroid().getViewRoot();
-    }
-
     /**
      * Sets the background color of the surface view.  This method is necessary because the
      * background color of ContentViewRenderView itself is covered by the background of
@@ -127,12 +124,13 @@ public class ContentViewRenderView extends FrameLayout {
         mNativeContentViewRenderView = 0;
     }
 
-    public void setCurrentContentViewCore(ContentViewCore contentViewCore) {
+    public void setCurrentContent(ContentViewCore contentViewCore, ViewRoot viewRoot) {
         assert mNativeContentViewRenderView != 0;
         mContentViewCore = contentViewCore;
+        mViewRoot = viewRoot;
 
-        if (mContentViewCore != null) {
-            getViewRoot().onPhysicalBackingSizeChanged(getWidth(), getHeight());
+        if (mContentViewCore != null && mViewRoot != null) {
+            mViewRoot.onPhysicalBackingSizeChanged(getWidth(), getHeight());
             nativeSetCurrentWebContents(
                     mNativeContentViewRenderView, mContentViewCore.getWebContents());
         } else {