Update from https://crrev.com/304121

sky/viewer/platform/weblayertreeview_impl.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 "sky/viewer/platform/weblayertreeview_impl.h"
 
 #include "base/message_loop/message_loop_proxy.h"
 #include "cc/layers/layer.h"
 #include "cc/output/begin_frame_args.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/trees/layer_tree_host.h"
 #include "mojo/cc/context_provider_mojo.h"
 #include "mojo/cc/output_surface_mojo.h"
 #include "mojo/converters/surfaces/surfaces_type_converters.h"
 #include "mojo/services/public/cpp/view_manager/view.h"
 #include "sky/engine/public/web/WebWidget.h"
 #include "sky/viewer/cc/web_layer_impl.h"
 
 namespace sky {
 
@@ skipping 20 matching lines @@
 
   cc::SharedBitmapManager* shared_bitmap_manager = NULL;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager = NULL;
 
   layer_tree_host_ =
       cc::LayerTreeHost::CreateThreaded(this,
                                         shared_bitmap_manager,
                                         gpu_memory_buffer_manager,
                                         settings,
                                         base::MessageLoopProxy::current(),
-                                        compositor_message_loop_proxy);
+                                        compositor_message_loop_proxy,
+                                        nullptr);
   DCHECK(layer_tree_host_);
 }
 
 WebLayerTreeViewImpl::~WebLayerTreeViewImpl() {
   layer_tree_host_.reset();
 }
 
 void WebLayerTreeViewImpl::WillBeginMainFrame(int frame_id) {
 }
 
@@ skipping 148 matching lines @@
       base::Bind(&WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread,
                  main_thread_bound_weak_ptr_,
                  id));
 }
 
 void WebLayerTreeViewImpl::DidCreateSurfaceOnMainThread(cc::SurfaceId id) {
   view_->SetSurfaceId(mojo::SurfaceId::From(id));
 }
 
 }  // namespace sky