Refactor how surfaces are acquired for GPU compositing.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

Index: chrome/browser/renderer_host/render_widget_host_view_gtk.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_gtk.cc b/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
index 2526816da26ed403a6d282186dc29ba6bb793dec..2129073b32b76a460f5614e843a57a9b57e4d7e2 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_gtk.cc
@@ -38,6 +38,7 @@
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/gtk_preserve_window.h"
+#include "ui/gfx/gtk_native_view_id_manager.h"
 #include "webkit/glue/webaccessibility.h"
 #include "webkit/glue/webcursor_gtk_data.h"
 #include "webkit/plugins/npapi/webplugin.h"
@@ -1088,6 +1089,23 @@ void RenderWidgetHostViewGtk::AcceleratedCompositingActivated(bool activated) {
   gtk_preserve_window_delegate_resize(widget, activated);
 }
 
+gfx::PluginWindowHandle RenderWidgetHostViewGtk::AcquireCompositingSurface() {
+  GtkNativeViewManager* manager = GtkNativeViewManager::GetInstance();
+  gfx::PluginWindowHandle surface = gfx::kNullPluginWindow;
+  gfx::NativeViewId view_id = gfx::IdFromNativeView(GetNativeView());
+
+  if (!manager->GetPermanentXIDForId(&surface, view_id)) {
+    DLOG(ERROR) << "Can't find XID for view id " << view_id;
+  }
+  return surface;
+}
+
+void RenderWidgetHostViewGtk::ReleaseCompositingSurface(
+    gfx::PluginWindowHandle surface) {
+  GtkNativeViewManager* manager = GtkNativeViewManager::GetInstance();
+  manager->ReleasePermanentXID(surface);
+}
+
 void RenderWidgetHostViewGtk::ForwardKeyboardEvent(
     const NativeWebKeyboardEvent& event) {
   if (!host_)