Retry tree activation if raster tasks finish during first half of vsync interval

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 "base/basictypes.h"
 #include "base/debug/trace_event.h"
@@ skipping 916 matching lines @@
 }
 
 void LayerTreeHostImpl::DidInitializeVisibleTile() {
   // TODO(reveman): Determine tiles that changed and only damage
   // what's necessary.
   SetFullRootLayerDamage();
   if (client_)
     client_->DidInitializeVisibleTileOnImplThread();
 }
 
+void LayerTreeHostImpl::DidFinishTileRasterTasks() {
+  client_->DidFinishTileRasterTasks();
+}
+
 bool LayerTreeHostImpl::ShouldClearRootRenderPass() const {
   return settings_.should_clear_root_render_pass;
 }
 
 void LayerTreeHostImpl::SetManagedMemoryPolicy(
     const ManagedMemoryPolicy& policy) {
   if (managed_memory_policy_ == policy)
     return;
 
   // If there is already enough memory to draw everything imaginable and the
@@ skipping 1141 matching lines @@
 }
 
 void LayerTreeHostImpl::SetDebugState(const LayerTreeDebugState& debug_state) {
   if (debug_state_.continuous_painting != debug_state.continuous_painting)
     paint_time_counter_->ClearHistory();
 
   debug_state_ = debug_state;
 }
 
 }  // namespace cc