Add UMA metrics for Android Chrome Google Search.

chrome/browser/google/google_search_counter.h

 // Copyright (c) 2012 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 CHROME_BROWSER_GOOGLE_GOOGLE_SEARCH_COUNTER_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_SEARCH_COUNTER_H_
 
 #include "base/memory/singleton.h"
 #include "components/google/core/browser/google_search_metrics.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
 // A listener for counting Google searches from various search access points. No
 // actual search query content is observed. See GoogleSearchMetrics for more
 // details about these access points.
 class GoogleSearchCounter : content::NotificationObserver {
  public:
   // Initialize the global instance.
   static void RegisterForNotifications();
 
   // Return the singleton instance of GoogleSearchCounter.
   static GoogleSearchCounter* GetInstance();
 
+  // Returns true if |details| is valid and corresponds to a search results
+  // page.
+  bool ShouldRecordCommittedDetails(
+      const content::NotificationDetails& details) const;
+
+  const GoogleSearchMetrics* search_metrics() const {
+    return search_metrics_.get();
+  }
+
  private:
   friend struct DefaultSingletonTraits<GoogleSearchCounter>;
   friend class GoogleSearchCounterTest;
 
   GoogleSearchCounter();
   virtual ~GoogleSearchCounter();
 
   void ProcessCommittedEntry(const content::NotificationSource& source,
                              const content::NotificationDetails& details);
 
   // Replace the internal metrics object with a dummy or a mock. This instance
   // takes ownership of |search_metrics|.
   void SetSearchMetricsForTesting(GoogleSearchMetrics* search_metrics);
 
   // Register this counter for all notifications we care about.
   void RegisterForNotificationsInternal();
 
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar registrar_;
   scoped_ptr<GoogleSearchMetrics> search_metrics_;
 
   DISALLOW_COPY_AND_ASSIGN(GoogleSearchCounter);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_SEARCH_COUNTER_H_