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

chrome/browser/ui/cocoa/base_bubble_controller.h

Index: chrome/browser/ui/cocoa/base_bubble_controller.h
diff --git a/chrome/browser/ui/cocoa/base_bubble_controller.h b/chrome/browser/ui/cocoa/base_bubble_controller.h
index c64fbfc8f4a2e23dd6964cb3622bf304dbbd6fec..46b1de1831f7efb22faad91b5587612b4e6c055e 100644
--- a/chrome/browser/ui/cocoa/base_bubble_controller.h
+++ b/chrome/browser/ui/cocoa/base_bubble_controller.h
@@ -31,6 +31,14 @@ class Bridge;
   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;
@@ -71,3 +79,11 @@ class Bridge;
 - (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