Moving background animation ticking from LayerTreeHostImpl into the Scheduler.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index a305dc031c4c109dab7f1bb54a0c3f30c962bf81..b797c1c96963d761622d6a32b841d68ea1a25712 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -173,77 +173,6 @@ size_t GetMaxStagingResourceCount() {
 
 }  // namespace
 
-class LayerTreeHostImplTimeSourceAdapter : public TimeSourceClient {
- public:
-  static scoped_ptr<LayerTreeHostImplTimeSourceAdapter> Create(
-      LayerTreeHostImpl* layer_tree_host_impl,
-      scoped_refptr<DelayBasedTimeSource> time_source) {
-    return make_scoped_ptr(
-        new LayerTreeHostImplTimeSourceAdapter(layer_tree_host_impl,
-                                               time_source));
-  }
-  ~LayerTreeHostImplTimeSourceAdapter() override {
-    time_source_->SetClient(NULL);
-    time_source_->SetActive(false);
-  }
-
-  void OnTimerTick() override {
-    // In single threaded mode we attempt to simulate changing the current
-    // thread by maintaining a fake thread id. When we switch from one
-    // thread to another, we construct DebugScopedSetXXXThread objects that
-    // update the thread id. This lets DCHECKS that ensure we're on the
-    // right thread to work correctly in single threaded mode. The problem
-    // here is that the timer tasks are run via the message loop, and when
-    // they run, we've had no chance to construct a DebugScopedSetXXXThread
-    // object. The result is that we report that we're running on the main
-    // thread. In multi-threaded mode, this timer is run on the compositor
-    // thread, so to keep this consistent in single-threaded mode, we'll
-    // construct a DebugScopedSetImplThread object. There is no need to do
-    // this in multi-threaded mode since the real thread id's will be
-    // correct. In fact, setting fake thread id's interferes with the real
-    // thread id's and causes breakage.
-    scoped_ptr<DebugScopedSetImplThread> set_impl_thread;
-    if (!layer_tree_host_impl_->proxy()->HasImplThread()) {
-      set_impl_thread.reset(
-          new DebugScopedSetImplThread(layer_tree_host_impl_->proxy()));
-    }
-
-    layer_tree_host_impl_->Animate(
-        layer_tree_host_impl_->CurrentBeginFrameArgs().frame_time);
-    layer_tree_host_impl_->UpdateBackgroundAnimateTicking(true);
-    bool start_ready_animations = true;
-    layer_tree_host_impl_->UpdateAnimationState(start_ready_animations);
-
-    if (layer_tree_host_impl_->pending_tree()) {
-      layer_tree_host_impl_->pending_tree()->UpdateDrawProperties();
-      layer_tree_host_impl_->ManageTiles();
-    }
-
-    layer_tree_host_impl_->ResetCurrentBeginFrameArgsForNextFrame();
-  }
-
-  void SetActive(bool active) {
-    if (active != time_source_->Active())
-      time_source_->SetActive(active);
-  }
-
-  bool Active() const { return time_source_->Active(); }
-
- private:
-  LayerTreeHostImplTimeSourceAdapter(
-      LayerTreeHostImpl* layer_tree_host_impl,
-      scoped_refptr<DelayBasedTimeSource> time_source)
-      : layer_tree_host_impl_(layer_tree_host_impl),
-        time_source_(time_source) {
-    time_source_->SetClient(this);
-  }
-
-  LayerTreeHostImpl* layer_tree_host_impl_;
-  scoped_refptr<DelayBasedTimeSource> time_source_;
-
-  DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImplTimeSourceAdapter);
-};
-
 LayerTreeHostImpl::FrameData::FrameData()
     : contains_incomplete_tile(false), has_no_damage(false) {}
 
@@ -974,28 +903,6 @@ void LayerTreeHostImpl::MainThreadHasStoppedFlinging() {
     input_handler_client_->MainThreadHasStoppedFlinging();
 }
 
-void LayerTreeHostImpl::UpdateBackgroundAnimateTicking(
-    bool should_background_tick) {
-  DCHECK(proxy_->IsImplThread());
-  if (should_background_tick)
-    DCHECK(active_tree_->root_layer());
-
-  bool enabled = should_background_tick && needs_animate_layers();
-
-  // Lazily create the time_source adapter so that we can vary the interval for
-  // testing.
-  if (!time_source_client_adapter_) {
-    time_source_client_adapter_ = LayerTreeHostImplTimeSourceAdapter::Create(
-        this,
-        DelayBasedTimeSource::Create(
-            LowFrequencyAnimationInterval(),
-            proxy_->HasImplThread() ? proxy_->ImplThreadTaskRunner()
-                                    : proxy_->MainThreadTaskRunner()));
-  }
-
-  time_source_client_adapter_->SetActive(enabled);
-}
-
 void LayerTreeHostImpl::DidAnimateScrollOffset() {
   client_->SetNeedsCommitOnImplThread();
   client_->RenewTreePriority();
@@ -1888,9 +1795,6 @@ void LayerTreeHostImpl::ActivateSyncTree() {
         stats.draw_duration.GetLastTimeDelta());
   }
 
-  if (time_source_client_adapter_ && time_source_client_adapter_->Active())
-    DCHECK(active_tree_->root_layer());
-
   scoped_ptr<PageScaleAnimation> page_scale_animation =
       active_tree_->TakePageScaleAnimation();
   if (page_scale_animation) {
@@ -3195,10 +3099,8 @@ void LayerTreeHostImpl::ActivateAnimations() {
        iter != copy.end();
        ++iter)
     (*iter).second->ActivateAnimations();
-}
 
-base::TimeDelta LayerTreeHostImpl::LowFrequencyAnimationInterval() const {
-  return base::TimeDelta::FromSeconds(1);
+  SetNeedsAnimate();
 }
 
 std::string LayerTreeHostImpl::LayerTreeAsJson() const {