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..afeca29ca990e8c48d71f2433f29d9af2e8cf02e 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
@@ -31,7 +31,7 @@ public class ContentViewRenderView extends FrameLayout {
     private SurfaceHolder.Callback mSurfaceCallback;
 
     private final SurfaceView mSurfaceView;
-    protected ContentViewCore mContentViewCore;
+    private ViewRoot mViewRoot;
 
     /**
      * Constructs a new ContentViewRenderView.
@@ -71,8 +71,8 @@ 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 +94,6 @@ 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
@@ -129,12 +125,11 @@ public class ContentViewRenderView extends FrameLayout {
 
     public void setCurrentContentViewCore(ContentViewCore contentViewCore) {
         assert mNativeContentViewRenderView != 0;
-        mContentViewCore = contentViewCore;
-
-        if (mContentViewCore != null) {
-            getViewRoot().onPhysicalBackingSizeChanged(getWidth(), getHeight());
+        if (contentViewCore != null) {
+            mViewRoot = contentViewCore.getViewRoot();
+            mViewRoot.onPhysicalBackingSizeChanged(getWidth(), getHeight());
             nativeSetCurrentWebContents(
-                    mNativeContentViewRenderView, mContentViewCore.getWebContents());
+                    mNativeContentViewRenderView, contentViewCore.getWebContents());
         } else {
             nativeSetCurrentWebContents(mNativeContentViewRenderView, null);
         }