Introduce ViewRoot to forward input/view events to native

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index d1d9bcc0a6b43c13fc04fef344e081d4db04f7ef..294660a2fbd1cb586a9dadd333ac2c1f94ac2a5d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -2461,7 +2461,8 @@ public class Tab implements ViewGroup.OnHierarchyChangeListener,
         // (see http://crbug.com/340987).
         newContentViewCore.onSizeChanged(originalWidth, originalHeight, 0, 0);
         if (!bounds.isEmpty()) {
-            newContentViewCore.onPhysicalBackingSizeChanged(bounds.right, bounds.bottom);
+            newContentViewCore.getWebContents().getEventHandler().onPhysicalBackingSizeChanged(
+                    bounds.right, bounds.bottom);
         }
         newContentViewCore.onShow();
         setContentViewCore(newContentViewCore);