[cc] Adds source_id and sequence_number to BeginFrameArgs.

cc/blimp/layer_tree_host_remote.h

 // Copyright 2016 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.
 
 #ifndef CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_
 #define CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "cc/base/cc_export.h"
 #include "cc/blimp/remote_compositor_bridge_client.h"
 #include "cc/debug/layer_tree_debug_state.h"
+#include "cc/output/begin_frame_args.h"
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/surfaces/surface_sequence_generator.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "cc/trees/swap_promise_manager.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace cc {
@@ skipping 96 matching lines @@
   void MainFrameRequested(FramePipelineStage requested_pipeline_stage);
   void ScheduleMainFrameIfNecessary();
   void MainFrameComplete();
   void SerializeCurrentState(proto::LayerTreeHost* layer_tree_host_proto);
 
   const int id_;
   int source_frame_number_ = 0;
   bool visible_ = false;
   bool defer_commits_ = false;
 
+  // Provides |source_id| for BeginFrameArgs we create.
+  StubBeginFrameSource begin_frame_source_;
+  uint64_t begin_frame_number_ = BeginFrameArgs::kStartingFrameNumber;
+
   // In threaded/single-threaded mode, the LayerTree and Layers expect scroll/
   // scale updates to come from the impl thread only during the main frame.
   // Since we synchronize state outside of that, this is set so we can
   // temporarily report that a commit is in progress.
   bool synchronizing_client_updates_ = false;
 
   // Set to true if a main frame request is pending on the
   // RemoteCompositorBridge.
   bool main_frame_requested_from_bridge_ = false;
 
@@ skipping 31 matching lines @@
   SurfaceSequenceGenerator surface_sequence_generator_;
 
   base::WeakPtr<InputHandler> input_handler_weak_ptr_;
 
   base::WeakPtrFactory<LayerTreeHostRemote> weak_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_BLIMP_LAYER_TREE_HOST_REMOTE_H_