Add detached mode plumbing

content/browser/renderer_host/render_widget_host_view_mac.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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 1632 matching lines @@
   // Do not touch any members at this point, |this| has been deleted.
 }
 
 void RenderWidgetHostViewMac::ShutdownBrowserCompositor() {
   DestroyBrowserCompositorView();
   delegated_frame_host_.reset();
   root_layer_.reset();
   browser_compositor_placeholder_.reset();
 }
 
+gfx::NativeWindow RenderWidgetHostViewMac::CreateDetachedModeWindow() {
+  if (browser_compositor_) {
+    return browser_compositor_->accelerated_widget_mac()
+        ->CreateDetachedModeWindow();
+  }
+  return nil;
+}
+
 void RenderWidgetHostViewMac::SetActive(bool active) {
   if (render_widget_host_) {
     render_widget_host_->SetActive(active);
     if (active) {
       if (HasFocus())
         render_widget_host_->Focus();
     } else {
       render_widget_host_->Blur();
     }
   }
@@ skipping 1828 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end