Allow out-of-process iframes to render to compositing surfaces.

content/browser/frame_host/render_widget_host_view_guest.cc

 // 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.
 
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/frame_host/render_widget_host_view_guest.h"
@@ skipping 371 matching lines @@
 }
 
 void RenderWidgetHostViewGuest::GetScreenInfo(blink::WebScreenInfo* results) {
   if (!guest_)
     return;
   RenderWidgetHostViewBase* embedder_view = GetOwnerRenderWidgetHostView();
   if (embedder_view)
     embedder_view->GetScreenInfo(results);
 }
 
+uint32_t RenderWidgetHostViewGuest::GetSurfaceIdNamespace() {
+  // Compositing surfaces not supported.
+  return 0;
+}
+
 #if defined(OS_MACOSX)
 void RenderWidgetHostViewGuest::SetActive(bool active) {
   platform_view_->SetActive(active);
 }
 
 void RenderWidgetHostViewGuest::SetWindowVisibility(bool visible) {
   platform_view_->SetWindowVisibility(visible);
 }
 
 void RenderWidgetHostViewGuest::WindowFrameChanged() {
@@ skipping 189 matching lines @@
   }
 
   if (blink::WebInputEvent::isGestureEventType(event->type)) {
     host_->ForwardGestureEvent(
         *static_cast<const blink::WebGestureEvent*>(event));
     return;
   }
 }
 
 }  // namespace content