Ensure permission bubble is stacked below the exclusive access bubble.

chrome/browser/ui/cocoa/website_settings/permission_bubble_view_cocoa_views.mm

 // Copyright 2016 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.
 
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
+#include "chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h"
 #import "chrome/browser/ui/cocoa/website_settings/permission_bubble_cocoa.h"
 #import "chrome/browser/ui/cocoa/website_settings/permission_bubble_controller.h"
 #import "chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h"
 #include "chrome/browser/ui/views/website_settings/permissions_bubble_view.h"
 #import "ui/base/cocoa/cocoa_base_utils.h"
 #import "ui/gfx/mac/coordinate_conversion.h"
 
 // Implementation of PermissionBubbleViewViews' anchor methods for Cocoa
 // browsers. In Cocoa browsers there is no parent views::View for the permission
 // bubble, so these methods supply an anchor point instead.
 
 views::View* PermissionBubbleViewViews::GetAnchorView() {
   return nullptr;
 }
 
 gfx::Point PermissionBubbleViewViews::GetAnchorPoint() {
   return gfx::ScreenPointFromNSPoint(
       [PermissionBubbleController getAnchorPointForBrowser:browser_]);
 }
 
 views::BubbleBorder::Arrow PermissionBubbleViewViews::GetAnchorArrow() {
   return [PermissionBubbleController hasVisibleLocationBarForBrowser:browser_]
              ? views::BubbleBorder::TOP_LEFT
              : views::BubbleBorder::NONE;
 }
 
+gfx::NativeView PermissionBubbleViewViews::GetExclusiveAccessNativeView() {
+  BrowserWindowController* controller = [BrowserWindowController
+      browserWindowControllerForWindow:browser_->window()->GetNativeWindow()];
+  return [controller exclusiveAccessController]->GetNativeView();
+}
+
 // static
 std::unique_ptr<PermissionBubbleView> PermissionBubbleView::Create(
     Browser* browser) {
   if (chrome::ToolkitViewsWebUIDialogsEnabled())
     return base::WrapUnique(new PermissionBubbleViewViews(browser));
   return base::WrapUnique(new PermissionBubbleCocoa(browser));
 }