Add UMA metrics for Android Chrome Google Search.

chrome/browser/google/google_search_counter.h

Index: chrome/browser/google/google_search_counter.h
diff --git a/chrome/browser/google/google_search_counter.h b/chrome/browser/google/google_search_counter.h
index be60c6a891a9b0a98e3f284880c9e49066e578fa..0250e25fc677357360b144b5dcb5d5ef57ef6f54 100644
--- a/chrome/browser/google/google_search_counter.h
+++ b/chrome/browser/google/google_search_counter.h
@@ -21,6 +21,15 @@ class GoogleSearchCounter : content::NotificationObserver {
   // 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;