DialogBrowserTest implementation to invoke Content settings bubble dialogs.

chrome/browser/ui/views/location_bar/location_bar_view.h

Index: chrome/browser/ui/views/location_bar/location_bar_view.h
diff --git a/chrome/browser/ui/views/location_bar/location_bar_view.h b/chrome/browser/ui/views/location_bar/location_bar_view.h
index b8aae5109f803fcd29b3015b729a859c100c0aa1..dcf048d1214125d211a466f62974eee09341f1a5 100644
--- a/chrome/browser/ui/views/location_bar/location_bar_view.h
+++ b/chrome/browser/ui/views/location_bar/location_bar_view.h
@@ -246,6 +246,7 @@ class LocationBarView : public LocationBar,
  private:
   using ContentSettingViews = std::vector<ContentSettingImageView*>;
 
+  friend class ContentSettingBubbleDialogTest;
   friend class PageActionImageView;
   friend class PageActionWithBadgeView;
   using PageActions = std::vector<ExtensionAction*>;
@@ -353,6 +354,7 @@ class LocationBarView : public LocationBar,
   ExtensionAction* GetVisiblePageAction(size_t index) override;
   void TestPageActionPressed(size_t index) override;
   bool GetBookmarkStarVisibility() override;
+  bool TestContentSettingImagePressed(size_t index) override;
 
   // views::View:
   const char* GetClassName() const override;