Added UMA collection for fullscreen / mouse lock bubble re-shows.

chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h

Index: chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h
diff --git a/chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h b/chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h
index 11e8e0d19d1fb207945f30716dfe012c7d315c9b..a167def026fedd4d80da3766eee654db81572051 100644
--- a/chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h
+++ b/chrome/browser/ui/exclusive_access/exclusive_access_controller_base.h
@@ -65,6 +65,12 @@ class ExclusiveAccessControllerBase : public content::NotificationObserver {
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // For recording UMA.
+  // Called when the bubble UI is reshown after a timeout.
+  void BubbleReshown();
+  // For recording UMA. Called when the exclusive access session ends.
+  void Exiting();
+
  protected:
   void SetTabWithExclusiveAccess(content::WebContents* tab);
 
@@ -77,6 +83,9 @@ class ExclusiveAccessControllerBase : public content::NotificationObserver {
   // if necessary.
   virtual void NotifyTabExclusiveAccessLost() = 0;
 
+  // Prefix used in the name of histograms relating to this type of controller.
+  virtual const char* HistogramPrefix() = 0;
+
  private:
   void UpdateNotificationRegistrations();
 
@@ -84,7 +93,10 @@ class ExclusiveAccessControllerBase : public content::NotificationObserver {
 
   content::NotificationRegistrar registrar_;
 
-  content::WebContents* tab_with_exclusive_access_;
+  content::WebContents* tab_with_exclusive_access_ = nullptr;
+
+  // The number of bubble re-shows for the current session (reset upon exiting).
+  int bubble_reshow_count_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(ExclusiveAccessControllerBase);
 };