Add FirstRun.SearchEngineBubble UMA histogram counts.

chrome/browser/first_run/first_run.h

Index: chrome/browser/first_run/first_run.h
diff --git a/chrome/browser/first_run/first_run.h b/chrome/browser/first_run/first_run.h
index 29ef02b3484afc5e6b47a6acfd42f651d9541956..be7e8302d21bb06e4cd1115c9d5cd338faa1edfe 100644
--- a/chrome/browser/first_run/first_run.h
+++ b/chrome/browser/first_run/first_run.h
@@ -33,6 +33,12 @@ class ProcessSingleton;
 // 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_INVOKED,  // The bubble's "Change" was invoked.
+  NUM_FIRST_RUN_BUBBLE_METRICS
+};
+
 // See ProcessMasterPreferences for more info about this structure.
 struct MasterPrefs {
   MasterPrefs();
@@ -74,6 +80,9 @@ bool SetShowWelcomePagePref();
 // Returns false if the pref could not be set.
 bool SetPersonalDataManagerFirstRunPref();
 
+// Log a metric for the "FirstRun.SearchEngineBubble" histogram.
+void LogFirstRunMetric(FirstRunBubbleMetric metric);
+
 // -- Platform-specific functions --
 
 // Automatically import history and home page (and search engine, if