Ensure permission bubble is stacked below the exclusive access bubble.

chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h

Index: chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h
diff --git a/chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h b/chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h
index e82f167d644d75605c5064f0b391e42cc6f5ea15..128970a1a43a7e2935bd78ce709733c87658f23e 100644
--- a/chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h
+++ b/chrome/browser/ui/cocoa/browser/exclusive_access_controller_views.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/ui/views/exclusive_access_bubble_views_context.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "ui/base/accelerators/accelerator.h"
+#include "ui/gfx/native_widget_types.h"
 
 class Browser;
 class BrowserWindow;
@@ -54,6 +55,9 @@ class ExclusiveAccessController : public ExclusiveAccessContext,
   // If showing, position the bubble at the given y-coordinate.
   void Layout(CGFloat max_y);
 
+  // Gets the NativeView associated with this bubble.
+  gfx::NativeView GetNativeView();
+
   // ExclusiveAccessContext:
   Profile* GetProfile() override;
   bool IsFullscreen() const override;