Add UMA metrics for Android Chrome Google Search.

components/google/core/browser/google_search_metrics.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_GOOGLE_CORE_BROWSER_GOOGLE_SEARCH_METRICS_H_
 #define COMPONENTS_GOOGLE_CORE_BROWSER_GOOGLE_SEARCH_METRICS_H_
 
+#include "build/build_config.h"
+
 // A thin helper class used by parties interested in reporting Google search
 // metrics (mostly counts of searches from different access points). This class
 // partly exists to make testing easier.
 class GoogleSearchMetrics {
  public:
   // Various Google Search access points, to be used with UMA enumeration
   // histograms.
   enum AccessPoint {
     AP_OMNIBOX,
     AP_OMNIBOX_INSTANT,
     AP_DIRECT_NAV,
     AP_DIRECT_NAV_INSTANT,
     AP_HOME_PAGE,
     AP_HOME_PAGE_INSTANT,
     AP_SEARCH_APP,
     AP_SEARCH_APP_INSTANT,
     AP_OTHER,
     AP_OTHER_INSTANT,
     AP_BOUNDARY,
   };
 
   GoogleSearchMetrics();
   virtual ~GoogleSearchMetrics();
 
   // Record a single Google search from source |ap|.
   virtual void RecordGoogleSearch(AccessPoint ap) const;
+
+#if defined(OS_ANDROID)
+  // Record a single Android Google search from source |ap|. |prerender_enabled|
+  // is set to true when prerendering is enabled via settings.
+  virtual void RecordAndroidGoogleSearch(AccessPoint ap,
+                                         bool prerender_enabled) const;
+#endif
 };
 
 #endif  // COMPONENTS_GOOGLE_CORE_BROWSER_GOOGLE_SEARCH_METRICS_H_