[Mac] DialogBrowserTest implementation to invoke Content settings bubble dialogs.

chrome/browser/ui/location_bar/location_bar.h

Index: chrome/browser/ui/location_bar/location_bar.h
diff --git a/chrome/browser/ui/location_bar/location_bar.h b/chrome/browser/ui/location_bar/location_bar.h
index f566d39e8f42939c83f747a570989d3e2d1998fe..db1acadae95d7858615cab02f0cb2695860190d1 100644
--- a/chrome/browser/ui/location_bar/location_bar.h
+++ b/chrome/browser/ui/location_bar/location_bar.h
@@ -129,6 +129,10 @@ class LocationBarTesting {
   // Returns whether or not the bookmark star decoration is visible.
   virtual bool GetBookmarkStarVisibility() = 0;
 
+  // Simulates a left mouse pressed on the content setting image at |index|.
+  // Returns false if there is none.
+  virtual bool TestContentSettingImagePressed(size_t index) = 0;
+
  protected:
   virtual ~LocationBarTesting() {}
 };