Implement new compositor and ContentViewCore reparenting for VR Shell.

chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
index 62ce11d43cf8e9ca78e552c86fe184a6348501f5..85abde84758d6d613ac3516858f6947c8312da18 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeTabbedActivity.java
@@ -1597,4 +1597,11 @@ public class ChromeTabbedActivity extends ChromeActivity implements OverviewMode
     public boolean isVrShellEnabled() {
         return mVrShellDelegate.isVrShellEnabled();
     }
+
+    // TODO(mthiesse): Toggle toolbar overlay, popups, etc.
+    public void setClankUIVisibilityForVR(int visibility) {

[bshe, 2016/09/12 16:39:56]

nit: Using Clank in function name is probably not a good idea. It is a internal
code name. 

[mthiesse, 2016/09/12 21:46:03]

Done.

+        mControlContainer.setVisibility(visibility);
+        getCompositorViewHolder().getSurfaceView().setVisibility(visibility);
+        getCompositorViewHolder().setVisibility(visibility);
+    }
 }