Switch WebVR to handle GvrApi management through VrShellDelegate

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser;
 
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.content.Context;
@@ skipping 223 matching lines @@
         }
     }
 
     @Override
     public void initializeCompositor() {
         try {
             TraceEvent.begin("ChromeTabbedActivity.initializeCompositor");
             super.initializeCompositor();
 
             mTabModelSelectorImpl.onNativeLibraryReady(getTabContentManager());
+            mVrShellDelegate.onNativeLibraryReady();
 
             mTabModelObserver = new EmptyTabModelObserver() {
                 @Override
                 public void didCloseTab(int tabId, boolean incognito) {
                     closeIfNoTabsAndHomepageEnabled(false);
                 }
 
                 @Override
                 public void tabPendingClosure(Tab tab) {
                     closeIfNoTabsAndHomepageEnabled(true);
@@ skipping 1342 matching lines @@
     }
 
     /**
      * See VrShellDelegate#isVrShellEnabled()
      */
     @Override
     public boolean isVrShellEnabled() {
         return mVrShellDelegate.isVrShellEnabled();
     }
 }