Refactor Vr activity into ChromeTabbedActivity.

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.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.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.SearchManager;
@@ skipping 1613 matching lines @@
             HelpAndFeedback.getInstance(this)
                     .show(this, helpContextId, currentTab.getProfile(), currentTab.getUrl());
             RecordUserAction.record("MobileMenuFeedback");
         } else {
             return false;
         }
         return true;
     }
 
     /**
+     * Tests if VR Shell (the mode displaying browser UI and tab contents in VR) is currently
+     * enabled.
+     */
+    public boolean isVrShellEnabled() {
+        return false;
+    }
+
+    /**
      * Add a view to the set of views that obscure the content of all tabs for
      * accessibility. As long as this set is nonempty, all tabs should be
      * hidden from the accessibility tree.
      *
      * @param view The view that obscures the contents of all tabs.
      */
     public void addViewObscuringAllTabs(View view) {
         mViewsObscuringAllTabs.add(view);
 
         Tab tab = getActivityTab();
@@ skipping 178 matching lines @@
                 "Android.MultiWindowMode.IsTabletScreenWidthBelow600",
                 mScreenWidthDp < DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP);
 
         if (mScreenWidthDp < DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP) {
             RecordHistogram.recordLinearCountHistogram(
                     "Android.MultiWindowMode.TabletScreenWidth", mScreenWidthDp, 1,
                     DeviceFormFactor.MINIMUM_TABLET_WIDTH_DP, 50);
         }
     }
 }