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 6c7cefe74e1c7900c4563ebadf1eced005ad40aa..7fa1adf5b53b48cdac3f3fff857bdb3ca7099f95 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;
+
     /**
      * The desired size of this view in {@link MeasureSpec}. Set by the host
      * when it should be different from that of the parent.
@@ -312,6 +315,8 @@ public class CompositorViewHolder extends CoordinatorLayout
             mCompositorView.getResourceManager().getDynamicResourceLoader().registerResource(
                     R.id.control_container, mControlContainer.getToolbarResourceAdapter());
         }
+
+        mEventHandler = windowAndroid.getEventHandler();
     }
 
     /**
@@ -949,7 +954,8 @@ public class CompositorViewHolder extends CoordinatorLayout
         if (mDesiredHeightMeasureSpec != ContentView.DEFAULT_MEASURE_SPEC) {
             height = MeasureSpec.getSize(mDesiredHeightMeasureSpec);
         }
-        contentViewCore.onPhysicalBackingSizeChanged(width, height);
+
+        mEventHandler.onPhysicalBackingSizeChanged(width, height);
     }
 
     /**