Introduce ViewRoot to forward input/view events to native

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index de98a5b56485d5c4c62ed80b33ad02f70b3c0869..dc79c3497ebbce670fa2950f6e4d88447000f657 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -87,6 +87,9 @@ import java.util.Map;
  * Provides a Java-side 'wrapper' around a WebContent (native) instance.
  * Contains all the major functionality necessary to manage the lifecycle of a ContentView without
  * being tied to the view system.
+ *
+ * WARNING: ContentViewCore is in the process of being broken up. Please do not add new stuff.
+ * See https://crbug.com/598880.
  */
 @JNINamespace("content")
 public class ContentViewCore implements AccessibilityStateChangeListener, DisplayAndroidObserver,
@@ -702,6 +705,16 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Displa
     }
 
     /**
+     * @return {@link ViewAndroidDelegate} providing the interface for native
+     *     layer for view-related events.
+     */
+    public ViewAndroidDelegate getViewDelegate() {
+        // TODO(jinsukkim): Remove this method once the view delegate instance becomes
+        //     available directly from embedder.
+        return mViewAndroidDelegate;
+    }
+
+    /**
      * Sets a new container view for this {@link ContentViewCore}.
      *
      * <p>WARNING: This method can also be used to replace the existing container view,
@@ -1487,21 +1500,6 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Displa
         updateAfterSizeChanged();
     }
 
-    /**
-     * Called when the underlying surface the compositor draws to changes size.
-     * This may be larger than the viewport size.
-     */
-    public void onPhysicalBackingSizeChanged(int wPix, int hPix) {
-        if (mPhysicalBackingWidthPix == wPix && mPhysicalBackingHeightPix == hPix) return;
-
-        mPhysicalBackingWidthPix = wPix;
-        mPhysicalBackingHeightPix = hPix;
-
-        if (mNativeContentViewCore != 0) {
-            nativeWasResized(mNativeContentViewCore);
-        }
-    }
-
     private void updateAfterSizeChanged() {
         mPopupZoomer.hide(false);