Tracks GVR version crossed with headset type using UMA.

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_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 {}
 
     public static final String VR_CORE_PACKAGE_ID = "com.google.vr.vrcore";
 
     /**
-     * Check if VrCore is installed or if installed version is compatible with Chromium.
+     * Returns the version of VrCore (if it is installed) and the compatibility of VrCore with
+     * Chromium.

[ddorwin, 2017/05/16 00:15:51]

nit: We refer to the product as Chrome in comments.

[tiborg, 2017/05/23 15:47:24]

Done.

      */
-    int getVrCoreCompatibility();
+    VrCoreInfo getVrCoreInfo();
 }