cc: Introduce BeginFrame sequence numbers and acknowledgements.

components/exo/surface.cc

 // Copyright 2015 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 "components/exo/surface.h"
 
 #include <utility>
 
 #include "base/callback_helpers.h"
 #include "base/logging.h"
@@ skipping 436 matching lines @@
       has_pending_layer_changes_ = true;
     }
   }
 
   if (delegate_) {
     delegate_->OnSurfaceCommit();
   } else {
     CheckIfSurfaceHierarchyNeedsCommitToNewSurfaces();
     CommitSurfaceHierarchy();
   }
+
+  cc::BeginFrameAck ack(last_begin_frame_args_.source_id,
+                        last_begin_frame_args_.sequence_number,
+                        last_begin_frame_args_.sequence_number, 0, true);
+  if (begin_frame_source_)
+    begin_frame_source_->DidFinishFrame(this, ack);
 }
 
 void Surface::CommitSurfaceHierarchy() {
   DCHECK(needs_commit_surface_hierarchy_);
   needs_commit_surface_hierarchy_ = false;
   has_pending_layer_changes_ = false;
 
   state_ = pending_state_;
   pending_state_.only_visible_on_secure_output = false;
 
@@ skipping 173 matching lines @@
       factory_owner_->frame_sink_id_);
 }
 
 void Surface::OnWindowRemovingFromRootWindow(aura::Window* window,
                                              aura::Window* new_root) {
   window->layer()->GetCompositor()->RemoveFrameSink(
       factory_owner_->frame_sink_id_);
 }
 
 void Surface::OnBeginFrame(const cc::BeginFrameArgs& args) {
+  last_begin_frame_args_ = args;
   while (!active_frame_callbacks_.empty()) {
     active_frame_callbacks_.front().Run(args.frame_time);
     active_frame_callbacks_.pop_front();
   }
-  last_begin_frame_args_ = args;
 }
 
 const cc::BeginFrameArgs& Surface::LastUsedBeginFrameArgs() const {
   return last_begin_frame_args_;
 }
 
 Surface::State::State() : input_region(SkIRect::MakeLargest()) {}
 
 Surface::State::~State() = default;
 
@@ skipping 209 matching lines @@
 
 int64_t Surface::GetPropertyInternal(const void* key,
                                      int64_t default_value) const {
   std::map<const void*, Value>::const_iterator iter = prop_map_.find(key);
   if (iter == prop_map_.end())
     return default_value;
   return iter->second.value;
 }
 
 }  // namespace exo