Introduce ViewRoot to forward input/view events to native

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
index f32f1b6d79369106d1125d1f95ea151ddf0ccfa6..516a1a2e5455712e45fd04af2e15b511f8277a9e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
@@ -41,6 +41,7 @@ import org.chromium.chrome.browser.tab.TabContentViewParent;
 import org.chromium.content.browser.ContentView;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content_public.browser.WebContents;
+import org.chromium.ui.base.EventHandler;
 import org.chromium.ui.base.ViewAndroidDelegate;
 import org.chromium.ui.base.WindowAndroid;
 import org.chromium.ui.display.DisplayAndroid;
@@ -275,7 +276,7 @@ public class VrShellImpl extends GvrLayout implements GLSurfaceView.Renderer, Vr
         mGlSurfaceView.post(mUpdateUiBufferSize);
         mUiCVCContainer.setLayoutParams(new FrameLayout.LayoutParams(
                 mUiSurfaceWidth, mUiSurfaceHeight));
-        mUiCVC.onPhysicalBackingSizeChanged(mUiSurfaceWidth, mUiSurfaceHeight);
+        getEventHandler(mUiCVC).onPhysicalBackingSizeChanged(mUiSurfaceWidth, mUiSurfaceHeight);
         if (mNativeVrShell == 0) return;
         nativeUIBoundsChanged(mNativeVrShell, mUiSurfaceWidth, mUiSurfaceHeight, dpr);
     }
@@ -292,7 +293,8 @@ public class VrShellImpl extends GvrLayout implements GLSurfaceView.Renderer, Vr
         mGlSurfaceView.post(mUpdateContentBufferSize);
         mContentCVCContainer.setLayoutParams(new FrameLayout.LayoutParams(
                 mContentSurfaceWidth, mContentSurfaceHeight));
-        mContentCVC.onPhysicalBackingSizeChanged(mContentSurfaceWidth, mContentSurfaceHeight);
+        getEventHandler(mContentCVC).onPhysicalBackingSizeChanged(
+                mContentSurfaceWidth, mContentSurfaceHeight);
         if (mNativeVrShell == 0) return;
         nativeContentBoundsChanged(mNativeVrShell, mContentSurfaceWidth, mContentSurfaceHeight,
                 dpr);
@@ -326,6 +328,10 @@ public class VrShellImpl extends GvrLayout implements GLSurfaceView.Renderer, Vr
         }
     }
 
+    private EventHandler getEventHandler(ContentViewCore cvc) {
+        return cvc.getWebContents().getEventHandler();
+    }
+
     @Override
     public void onSurfaceCreated(GL10 gl, EGLConfig config) {
         mContentTextureHandle = createExternalTextureHandle();