[Mac] Implement the basic zoom bubble.

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 9e26e8f9ac57e329173c6d2438a78ef8a84bdd52..bc70f83d159bb84e02404dca5da495c8918b296f 100644
--- a/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
+++ b/chrome/browser/ui/cocoa/location_bar/zoom_decoration.h
@@ -10,29 +10,38 @@
 #include "base/basictypes.h"
 #include "chrome/browser/ui/cocoa/location_bar/image_decoration.h"
 
-class ToolbarModel;
+class LocationBarViewMac;
+@class ZoomBubbleController;
 class ZoomController;
 
 // Zoom icon at the end of the omnibox (close to page actions) when at a
 // non-standard zoom level.
-// TODO(dbeam): add mouse event handlers to show a zoom bubble on click.
 class ZoomDecoration : public ImageDecoration {
  public:
-  explicit ZoomDecoration(ToolbarModel* toolbar_model);
+  explicit ZoomDecoration(LocationBarViewMac* owner);
   virtual ~ZoomDecoration();
 
   // Called when this decoration should show or hide itself in its most current
   // state.
   void Update(ZoomController* zoom_controller);
 
+  // Shows the zoom bubble for this decoration. If |auto_close| is YES, then
+  // the bubble will automatically close after a fixed period of time.
+  void ShowBubble(BOOL auto_close);
+
  private:
+  NSPoint GetBubblePointInFrame(NSRect frame);
+
   // LocationBarDecoration implementation.
   virtual bool AcceptsMousePress() OVERRIDE;
+  virtual bool OnMousePressed(NSRect frame) OVERRIDE;
   virtual NSString* GetToolTip() OVERRIDE;
 
-  // A reference to the toolbar model to query whether input is currently
-  // happening in the location bar. Not owned by this class.
-  ToolbarModel* toolbar_model_;
+  // The control that owns this. Weak.
+  LocationBarViewMac* owner_;
+
+  // The bubble that this decoration shows. Weak, owns self.
+  ZoomBubbleController* bubble_;
 
   // The string to show for a tooltip.
   scoped_nsobject<NSString> tooltip_;