Test FindBar audible alerts.

chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h

Index: chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h
diff --git a/chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h b/chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h
index de7358af41c53317633cea4bf15dba98d31f9289..c19c6d4badb8863a26b5dad1521444eb759ea96a 100644
--- a/chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h
+++ b/chrome/browser/ui/cocoa/find_bar/find_bar_bridge.h
@@ -76,6 +76,7 @@ class FindBarBridge : public FindBar,
   base::string16 GetFindSelectedText() override;
   base::string16 GetMatchCountText() override;
   int GetWidth() override;
+  size_t GetAudibleAlertCount() override;
 
   // Used to disable find bar animations when testing.
   static bool disable_animations_during_testing_;
@@ -88,6 +89,9 @@ class FindBarBridge : public FindBar,
   // Pointer back to the owning controller.
   FindBarController* find_bar_controller_;  // weak, owns us
 
+  // Number of audible alerts generated, for testing.
+  size_t audible_alerts_;
+
   DISALLOW_COPY_AND_ASSIGN(FindBarBridge);
 };