Order the GL overlays above windows if possible.

content/browser/web_contents/web_contents_view_guest.cc

 // 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.
 
 #include "content/browser/web_contents/web_contents_view_guest.h"
 
 #include "build/build_config.h"
 #include "content/browser/renderer_host/render_view_host_factory.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_guest.h"
@@ skipping 78 matching lines @@
     web_contents_->SetFocusToLocationBar(false);
   else
     Focus();
 }
 
 gfx::Rect WebContentsViewGuest::GetViewBounds() const {
   gfx::Rect rect(0, 0, requested_size_.width(), requested_size_.height());
   return rect;
 }
 
+#if defined(OS_MACOSX)
+void WebContentsViewGuest::SetAllowOverlappingViews(bool overlapping) {
+  NOTIMPLEMENTED();
+}
+#endif
+
 WebContents* WebContentsViewGuest::web_contents() {
   return web_contents_;
 }
 
 void WebContentsViewGuest::RenderViewCreated(RenderViewHost* host) {
 }
 
 bool WebContentsViewGuest::IsEventTracking() const {
   return false;
 }
@@ skipping 60 matching lines @@
 void WebContentsViewGuest::StartDragging(
     const WebDropData& drop_data,
     WebDragOperationsMask ops,
     const gfx::ImageSkia& image,
     const gfx::Vector2d& image_offset,
     const DragEventSourceInfo& event_info) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace content