[Mac] Have BaseBubbleController dismiss bubbles when they would lose key state on 10.8.

chrome/browser/ui/cocoa/base_bubble_controller.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace BaseBubbleControllerInternal {
@@ skipping 13 matching lines @@
 // 2. Create a subclass of BaseBubbleController.
 // 3. Change the xib's File Owner to your subclass.
 // 4. Hook up the File Owner's |bubble_| to the InfoBubbleView in the xib.
 @interface BaseBubbleController : NSWindowController<NSWindowDelegate> {
  @private
   NSWindow* parentWindow_;  // weak
   NSPoint anchor_;
   IBOutlet InfoBubbleView* bubble_;  // to set arrow position
   // Bridge that listens for notifications.
   scoped_ptr<BaseBubbleControllerInternal::Bridge> baseBridge_;
+
+  // Non-nil only on 10.7+. Both weak, owned by AppKit.
+  // A local event tap that will dismiss the bubble when a click is delivered
+  // outside the window. This is needed because the window shares first
+  // responder with its parent.
+  id eventTap_;
+  // A notification observer that gets triggered when any window resigns key.
+  id resignationObserver_;
 }
 
 @property(nonatomic, readonly) NSWindow* parentWindow;
 // The point in base screen coordinates at which the bubble should open and the
 // arrow tip points.
 @property(nonatomic, assign) NSPoint anchorPoint;
 @property(nonatomic, readonly) InfoBubbleView* bubble;
 
 // Creates a bubble. |nibPath| is just the basename, e.g. @"FirstRunBubble".
 // |anchoredAt| is in screen space. You need to call -showWindow: to make the
@@ skipping 20 matching lines @@
 // contentView with an instance of InfoBubbleView.
 - (id)initWithWindow:(NSWindow*)theWindow
         parentWindow:(NSWindow*)parentWindow
           anchoredAt:(NSPoint)anchoredAt;
 
 // Creates an autoreleased separator view with a given frame. The height of the
 // frame is ignored.
 - (NSBox*)separatorWithFrame:(NSRect)frame;
 
 @end
+
+// Methods for use by subclasses.
+@interface BaseBubbleController (Protected)
+// Registers event taps *after* the window is shown so that the bubble is
+// dismissed when it resigns key. This only needs to be called if
+// |-showWindow:| is overriden and does not call super. Noop on OSes <10.7.
+- (void)registerKeyStateEventTap;
+@end