Introduce ViewRoot to forward input/view events to native

content/browser/web_contents/web_contents_view_android.h

Index: content/browser/web_contents/web_contents_view_android.h
diff --git a/content/browser/web_contents/web_contents_view_android.h b/content/browser/web_contents/web_contents_view_android.h
index 2c655a6f62aaf80e8815f7924b116e6073e067f6..a9902d03f71ca46f071414c04279f6542299c865 100644
--- a/content/browser/web_contents/web_contents_view_android.h
+++ b/content/browser/web_contents/web_contents_view_android.h
@@ -23,7 +23,8 @@ class WebContentsImpl;
 
 // Android-specific implementation of the WebContentsView.
 class WebContentsViewAndroid : public WebContentsView,
-                               public RenderViewHostDelegateView {
+                               public RenderViewHostDelegateView,
+                               public ui::ViewAndroid::ViewClient {
  public:
   WebContentsViewAndroid(WebContentsImpl* web_contents,
                          WebContentsViewDelegate* delegate);
@@ -67,6 +68,9 @@ class WebContentsViewAndroid : public WebContentsView,
   void RenderViewSwappedIn(RenderViewHost* host) override;
   void SetOverscrollControllerEnabled(bool enabled) override;
 
+  // ViewAndroid::ViewClient implementation.
+  bool OnPhysicalBackingSizeChanged(int width, int height);
+
   // Backend implementation of RenderViewHostDelegateView.
   void ShowContextMenu(RenderFrameHost* render_frame_host,
                        const ContextMenuParams& params) override;