Mac: Update zoom bubble UI

chrome/browser/ui/cocoa/location_bar/zoom_decoration.h

Index: chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
diff --git a/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h b/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
index bc70f83d159bb84e02404dca5da495c8918b296f..a51ffca070b0d847104f07c6a7bef216cb070a17 100644
--- a/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
+++ b/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
@@ -13,6 +13,7 @@
 class LocationBarViewMac;
 @class ZoomBubbleController;
 class ZoomController;
+class ZoomDecorationTest;
 
 // Zoom icon at the end of the omnibox (close to page actions) when at a
 // non-standard zoom level.
@@ -30,7 +31,11 @@ class ZoomDecoration : public ImageDecoration {
   void ShowBubble(BOOL auto_close);
 
  private:
+  friend ZoomDecorationTest;
+
   NSPoint GetBubblePointInFrame(NSRect frame);
+  bool IsAtDefaultZoom() const;
+  bool ShouldShowDecoration() const;
 
   // LocationBarDecoration implementation.
   virtual bool AcceptsMousePress() OVERRIDE;