Add FirstRun.SearchEngineBubble UMA histogram counts.

chrome/browser/first_run/first_run.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_FIRST_RUN_FIRST_RUN_H_
 #define CHROME_BROWSER_FIRST_RUN_FIRST_RUN_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 15 matching lines @@
 // fully test the custom installer. It also contains the opposite actions to
 // execute during uninstall. When the first run UI is ready we won't
 // do the actions unconditionally. Currently the only action is to create a
 // desktop shortcut.
 //
 // The way we detect first-run is by looking at a 'sentinel' file.
 // If it does not exist we understand that we need to do the first time
 // install work for this user. After that the sentinel file is created.
 namespace first_run {
 
+enum FirstRunBubbleMetric {
+  FIRST_RUN_BUBBLE_SHOWN = 0,             // The search engine bubble was shown.
+  FIRST_RUN_BUBBLE_CHANGE_SEARCH_INVOKED, // The bubble's "Change" was invoked.
+  NUM_FIRST_RUN_BUBBLE_METRICS
+};
+
 // See ProcessMasterPreferences for more info about this structure.
 struct MasterPrefs {
   MasterPrefs();
   ~MasterPrefs();
 
   int ping_delay;
   bool homepage_defined;
   int do_import_items;
   int dont_import_items;
   bool make_chrome_default;
@@ skipping 82 matching lines @@
                        const content::NotificationDetails& details) OVERRIDE;
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(FirstRunBubbleLauncher);
 };
 
 }  // namespace first_run
 
 #endif  // CHROME_BROWSER_FIRST_RUN_FIRST_RUN_H_