Order the GL overlays above windows if possible.

content/browser/renderer_host/render_widget_host_view_mac.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 #include <list>
 #include <map>
@@ skipping 181 matching lines @@
 //     references to it must become NULL."
 //
 // RenderWidgetHostView class hierarchy described in render_widget_host_view.h.
 class RenderWidgetHostViewMac : public RenderWidgetHostViewBase {
  public:
   virtual ~RenderWidgetHostViewMac();
 
   RenderWidgetHostViewCocoa* cocoa_view() const { return cocoa_view_; }
 
   void SetDelegate(NSObject<RenderWidgetHostViewMacDelegate>* delegate);
+  void SetAllowOverlappingViews(bool overlapping);
 
   // RenderWidgetHostView implementation.
   virtual void InitAsChild(gfx::NativeView parent_view) OVERRIDE;
   virtual RenderWidgetHost* GetRenderWidgetHost() const OVERRIDE;
   virtual void SetSize(const gfx::Size& size) OVERRIDE;
   virtual void SetBounds(const gfx::Rect& rect) OVERRIDE;
   virtual gfx::NativeView GetNativeView() const OVERRIDE;
   virtual gfx::NativeViewId GetNativeViewId() const OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual bool HasFocus() const OVERRIDE;
@@ skipping 206 matching lines @@
 
   typedef std::map<gfx::PluginWindowHandle, AcceleratedPluginView*>
       PluginViewMap;
   PluginViewMap plugin_views_;  // Weak values.
 
   // Helper class for managing instances of accelerated plug-ins.
   AcceleratedSurfaceContainerManagerMac plugin_container_manager_;
 
   scoped_ptr<CompositingIOSurfaceMac> compositing_iosurface_;
 
+  // Whether to allow overlapping views.
+  bool allow_overlapping_views_;
+
   NSWindow* pepper_fullscreen_window() const {
     return pepper_fullscreen_window_;
   }
 
   RenderWidgetHostViewMac* fullscreen_parent_host_view() const {
     return fullscreen_parent_host_view_;
   }
 
  private:
   friend class RenderWidgetHostView;
@@ skipping 50 matching lines @@
 
   // The current caret bounds.
   gfx::Rect caret_rect_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_MAC_H_