Refactor how surfaces are acquired for GPU compositing.

chrome/browser/renderer_host/render_widget_host_view_win.cc

 // Copyright (c) 2010 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 "chrome/browser/renderer_host/render_widget_host_view_win.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
@@ skipping 1527 matching lines @@
     PaintCompositorHostWindow(hWnd);
     return 0;
   default:
     return DefWindowProc(hWnd, message, wParam, lParam);
   }
 }
 
 // Creates a HWND within the RenderWidgetHostView that will serve as a host
 // for a HWND that the GPU process will create. The host window is used
 // to Z-position the GPU's window relative to other plugin windows.
-gfx::PluginWindowHandle RenderWidgetHostViewWin::GetCompositorHostWindow() {
+gfx::PluginWindowHandle RenderWidgetHostViewWin::AcquireCompositingSurface() {
   // If the window has been created, don't recreate it a second time
   if (compositor_host_window_)
     return compositor_host_window_;
 
   static ATOM window_class = 0;
   if (!window_class) {
     WNDCLASSEX wcex;
     wcex.cbSize         = sizeof(WNDCLASSEX);
     wcex.style          = 0;
     wcex.lpfnWndProc    = CompositorHostWindowProc;
@@ skipping 18 matching lines @@
   compositor_host_window_ = CreateWindowEx(
     WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR,
     MAKEINTATOM(window_class), 0,
     WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_DISABLED,
     0, 0, width, height, m_hWnd, 0, GetModuleHandle(NULL), 0);
   DCHECK(compositor_host_window_);
 
   return static_cast<gfx::PluginWindowHandle>(compositor_host_window_);
 }
 
+void RenderWidgetHostViewWin::ReleaseCompositingSurface(
+    gfx::PluginWindowHandle surface) {
+  ShowCompositorHostWindow(false);
+}
+
 void RenderWidgetHostViewWin::ShowCompositorHostWindow(bool show) {
   // When we first create the compositor, we will get a show request from
   // the renderer before we have gotten the create request from the GPU. In this
   // case, simply ignore the show request.
   if (compositor_host_window_ == NULL)
     return;
 
   if (show) {
     UINT flags = SWP_NOSENDCHANGING | SWP_NOCOPYBITS | SWP_NOZORDER |
       SWP_NOACTIVATE | SWP_DEFERERASE | SWP_SHOWWINDOW;
@@ skipping 212 matching lines @@
 }
 
 // static
 RenderWidgetHostView*
     RenderWidgetHostView::GetRenderWidgetHostViewFromNativeView(
         gfx::NativeView native_view) {
   return ::IsWindow(native_view) ?
       reinterpret_cast<RenderWidgetHostView*>(
           ViewProp::GetValue(native_view, kRenderWidgetHostViewKey)) : NULL;
 }