WIP - Gutterless resize on Windows

content/browser/renderer_host/render_widget_resize_helper_mac.h

-// Copyright 2014 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_RESIZE_HELPER_MAC_H_
-#define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_RESIZE_HELPER_MAC_H_
-
-#include "base/macros.h"
-
-namespace IPC {
-class Message;
-}
-
-namespace content {
-
-// Provides functions for content to synchronize with window resize tasks being
-// managed by ui::WindowResizeHelperMac. WindowResizeHelperMac must be
-// initialized before calling these functions.
-//
-// The IPCs that are required to create new frames for smooth resize are sent
-// to the ui::WindowResizeHelperMac singleton using the PostRendererProcessMsg()
-// and PostGpuProcessMsg() methods. Usually those IPCs arrive on the IO thread
-// and are posted as tasks to the UI thread either by the RenderMessageFilter
-// (for renderer processes) or the GpuProcessHostUIShim (for the GPU process).
-// By posting them via RenderWidgetResizeHelper instead, it allows a smooth
-// window resize to be controlled by WindowResizeHelperMac.
-class RenderWidgetResizeHelper {
- public:
-  // IO THREAD ONLY -----------------------------------------------------------
-
-  // This will cause |msg| to be handled by the RenderProcessHost corresponding
-  // to |render_process_id|, on the UI thread. This will either happen when the
-  // ordinary message loop would run it, or potentially earlier in a call to
-  // WindowResizeHelperMac::WaitForSingleTaskToRun().
-  static void PostRendererProcessMsg(int render_process_id,
-                                     const IPC::Message& msg);
-
-  // This is similar to PostRendererProcessMsg, but will handle the message in
-  // the GpuProcessHostUIShim corresponding to |gpu_host_id|.
-  static void PostGpuProcessMsg(int gpu_host_id, const IPC::Message& msg);
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(RenderWidgetResizeHelper);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_RESIZE_HELPER_MAC_H_