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