Deliver IPC messages together with SwapCompositorFrame

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 1255 matching lines @@
   SetManagedMemoryPolicy(policy, zero_budget_);
 }
 
 void LayerTreeHostImpl::SetTreeActivationCallback(
     const base::Closure& callback) {
   DCHECK(proxy_->IsImplThread());
   DCHECK(settings_.impl_side_painting || callback.is_null());
   tree_activation_callback_ = callback;
 }
 
+int LayerTreeHostImpl::GetSourceFrameNumber() {
+  return active_tree_->source_frame_number();
+}
+
 void LayerTreeHostImpl::SetManagedMemoryPolicy(
     const ManagedMemoryPolicy& policy, bool zero_budget) {
   if (cached_managed_memory_policy_ == policy && zero_budget_ == zero_budget)
     return;
 
   ManagedMemoryPolicy old_policy = ActualManagedMemoryPolicy();
 
   cached_managed_memory_policy_ = policy;
   zero_budget_ = zero_budget;
   ManagedMemoryPolicy actual_policy = ActualManagedMemoryPolicy();
@@ skipping 1845 matching lines @@
   swap_promise_monitor_.erase(monitor);
 }
 
 void LayerTreeHostImpl::NotifySwapPromiseMonitorsOfSetNeedsRedraw() {
   std::set<SwapPromiseMonitor*>::iterator it = swap_promise_monitor_.begin();
   for (; it != swap_promise_monitor_.end(); it++)
     (*it)->OnSetNeedsRedrawOnImpl();
 }
 
 }  // namespace cc