Mac ÜC: Enable back-pressure for the browser compositor

content/browser/renderer_host/render_widget_helper_mac.mm

 // 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 "content/browser/renderer_host/render_widget_helper.h"
 
 #import <Cocoa/Cocoa.h>
 #include <IOSurface/IOSurfaceAPI.h>
 
 #include "base/bind.h"
 #include "content/browser/compositor/browser_compositor_view_mac.h"
 #include "content/browser/gpu/gpu_process_host.h"
 #include "content/browser/gpu/gpu_surface_tracker.h"
 #include "content/common/gpu/gpu_messages.h"
 
 namespace {
 
 void OnNativeSurfaceBuffersSwappedOnUIThread(
     base::ScopedCFTypeRef<IOSurfaceRef> io_surface,
     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   gfx::AcceleratedWidget native_widget =
       content::GpuSurfaceTracker::Get()->AcquireNativeWidget(params.surface_id);
   [native_widget gotAcceleratedIOSurfaceFrame:params.surface_handle
+                          withOutputSurfaceID:params.surface_id
                                 withPixelSize:params.size
                               withScaleFactor:params.scale_factor];
 }
 
 }  // namespace
 
 namespace content {
 
 void RenderWidgetHelper::OnNativeSurfaceBuffersSwappedOnIOThread(
     GpuProcessHost* gpu_process_host,
@@ skipping 17 matching lines @@
   base::ScopedCFTypeRef<IOSurfaceRef> io_surface(IOSurfaceLookup(
           static_cast<uint32>(params.surface_handle)));
 
   BrowserThread::PostTask(
       BrowserThread::UI,
       FROM_HERE,
       base::Bind(&OnNativeSurfaceBuffersSwappedOnUIThread, io_surface, params));
 }
 
 }  // namespace content