Set AllowOverlappingViews for history overlay

chrome/browser/ui/cocoa/history_overlay_controller.mm

 // 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 "chrome/browser/ui/cocoa/history_overlay_controller.h"
 
 #include "base/logging.h"
+#import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 
 // Constants ///////////////////////////////////////////////////////////////////
 
@@ skipping 68 matching lines @@
 - (id)initForMode:(HistoryOverlayMode)mode {
   if ((self = [super init])) {
     mode_ = mode;
     DCHECK(mode == kHistoryOverlayModeBack ||
            mode == kHistoryOverlayModeForward);
   }
   return self;
 }
 
 - (void)dealloc {
+  [[BrowserWindowController
+      browserWindowControllerForView:[self view]] onHistoryOverlayHidden];
   [self.view removeFromSuperview];
   [super dealloc];
 }
 
 - (void)loadView {
   const gfx::Image& image =
       ui::ResourceBundle::GetSharedInstance().GetNativeImageNamed(
           mode_ == kHistoryOverlayModeBack ? IDR_SWIPE_BACK
                                            : IDR_SWIPE_FORWARD);
   contentView_.reset(
@@ skipping 37 matching lines @@
   [contentView_ setShieldAlpha:shieldAlpha];
   [contentView_ setNeedsDisplay:YES];
 }
 
 - (void)showPanelForView:(NSView*)view {
   parent_.reset([view retain]);
   [self setProgress:0];  // Set initial view position.
   [[parent_ superview] addSubview:self.view
                        positioned:NSWindowAbove
                        relativeTo:parent_];
+  [[BrowserWindowController
+      browserWindowControllerForView:[self view]] onHistoryOverlayShown];
 }
 
 - (void)dismiss {
   const CGFloat kFadeOutDurationSeconds = 0.4;
 
   NSView* overlay = self.view;
 
   scoped_nsobject<CAAnimation> animation(
       [[overlay animationForKey:@"alphaValue"] copy]);
   [animation setDelegate:self];
   [animation setDuration:kFadeOutDurationSeconds];
   NSMutableDictionary* dictionary =
       [NSMutableDictionary dictionaryWithCapacity:1];
   [dictionary setObject:animation forKey:@"alphaValue"];
   [overlay setAnimations:dictionary];
   [[overlay animator] setAlphaValue:0.0];
 }
 
 - (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)finished {
   // Destroy the CAAnimation and its strong reference to its delegate (this
   // class).
   [self.view setAnimations:nil];
 }
 
 @end