Introduce ViewRoot to forward input/view events to native

chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
index fd3ce1dc0b963abbc9b80887bb37dbca6da1e37c..ad85dd44e7724cbc3d29e62cbc9f45970fbc9395 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/compositor/CompositorViewHolder.java
@@ -58,6 +58,7 @@ import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.SPenSupport;
 import org.chromium.ui.UiUtils;
 import org.chromium.ui.base.DeviceFormFactor;
+import org.chromium.ui.base.EventHandler;
 import org.chromium.ui.base.WindowAndroid;
 import org.chromium.ui.resources.ResourceManager;
 import org.chromium.ui.resources.dynamics.DynamicResourceLoader;
@@ -123,6 +124,8 @@ public class CompositorViewHolder extends CoordinatorLayout
     // If we've drawn at least one frame.
     private boolean mHasDrawnOnce = false;
 
+    private EventHandler mEventHandler;
+
     /**
      * This view is created on demand to display debugging information.
      */
@@ -295,6 +298,8 @@ public class CompositorViewHolder extends CoordinatorLayout
             mCompositorView.getResourceManager().getDynamicResourceLoader().registerResource(
                     R.id.control_container, mControlContainer.getToolbarResourceAdapter());
         }
+
+        mEventHandler = windowAndroid.getEventHandler();
     }
 
     /**
@@ -942,7 +947,7 @@ public class CompositorViewHolder extends CoordinatorLayout
             height = MeasureSpec.getSize(desiredHeightMeasureSpec);
         }
 
-        contentViewCore.onPhysicalBackingSizeChanged(width, height);
+        mEventHandler.onPhysicalBackingSizeChanged(width, height);
     }
 
     /**