mac: Window buttons should keep "active" view when bubbles / tabpose are open on 10.7

chrome/browser/ui/cocoa/tabpose_window.mm

 // Copyright (c) 2011 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 "chrome/browser/ui/cocoa/tabpose_window.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <algorithm>
 
@@ skipping 1178 matching lines @@
   // there's a one frame flash of grey at the beginning of the animation
   // (|bgLayer_| showing through with none of its children visible yet).
   [[self contentView] setLayer:rootLayer_];
   [[self contentView] setWantsLayer:YES];
 }
 
 - (BOOL)canBecomeKeyWindow {
  return YES;
 }
 
+// Lets the traffic light buttons on the browser window keep their "active"
+// state while an info bubble is open. Only has an effect on 10.7.
+- (BOOL)_sharesParentKeyState {
+  return YES;
+}
+
 // Handle key events that should be executed repeatedly while the key is down.
 - (void)keyDown:(NSEvent*)event {
   if (state_ == tabpose::kFadingOut)
     return;
   NSString* characters = [event characters];
   if ([characters length] < 1)
     return;
 
   unichar character = [characters characterAtIndex:0];
   int newIndex = -1;
@@ skipping 464 matching lines @@
   tile.set_tab_contents(contents);
   ThumbnailLayer* thumbLayer = [allThumbnailLayers_ objectAtIndex:index];
   [thumbLayer setTabContents:contents];
 }
 
 - (void)tabStripModelDeleted {
   [self close];
 }
 
 @end