Intercept WebVR api calls and check for VrCore compatibility.

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

 // Copyright 2016 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.vr_shell;
 
 import android.support.annotation.IntDef;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 
 /**
  * Abstracts away the VrCoreVersionCheckerImpl class, which may or may not be present at runtime
  * depending on compile flags.
  */
 public interface VrCoreVersionChecker {
-    public static final int VR_NOT_AVAILABLE = 0;
-    public static final int VR_OUT_OF_DATE = 1;
-    public static final int VR_READY = 2;
+    public static final int VR_NOT_SUPPORTED = 0;
+    public static final int VR_NOT_AVAILABLE = 1;
+    public static final int VR_OUT_OF_DATE = 2;
+    public static final int VR_READY = 3;
 
     @Retention(RetentionPolicy.SOURCE)
     @IntDef({VR_NOT_AVAILABLE, VR_OUT_OF_DATE, VR_READY})
     public @interface VrCoreCompatibility {}
 
     /**
      * Check if VrCore is installed or if installed version is compatible with Chromium.
      */
     int getVrCoreCompatibility();
 }