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

chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm

Index: chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
index 5c4a91e5b43a8b01b66e2755aa1c50d1582fbc0f..7bf0af0bdb47a7047a520c6556c5d9637af96463 100644
--- a/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
+++ b/chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.mm
@@ -332,6 +332,19 @@ bool LocationBarViewMac::GetBookmarkStarVisibility() {
   return star_decoration_->IsVisible();
 }
 
+bool LocationBarViewMac::TestContentSettingImagePressed(size_t index) {
+  if (index >= content_setting_decorations_.size())
+    return false;
+
+  // TODO(tapted): Use OnAccessibilityViewAction() here. Currently it's broken.
+  ContentSettingDecoration* decoration =
+      content_setting_decorations_[index].get();
+  AutocompleteTextFieldCell* cell = [field_ cell];
+  NSRect frame = [cell frameForDecoration:decoration inFrame:[field_ bounds]];
+  content_setting_decorations_[index]->OnMousePressed(frame, NSZeroPoint);
+  return true;
+}
+
 void LocationBarViewMac::SetEditable(bool editable) {
   [field_ setEditable:editable ? YES : NO];
   UpdateBookmarkStarVisibility();