cc: Make animations tick regardless of drawing.

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 d751441ed558158f30e9cd45b7a04a957e635901..833938986fa5d439b5540b5e10a9751a3a45a4af 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -112,6 +112,8 @@ class LayerTreeHostImplTimeSourceAdapter : public TimeSourceClient {
 
     layer_tree_host_impl_->ActivatePendingTreeIfNeeded();
     layer_tree_host_impl_->Animate(base::TimeTicks::Now(), base::Time::Now());
+    layer_tree_host_impl_->UpdateBackgroundAnimateTicking();
+    layer_tree_host_impl_->UpdateAnimationState();
     layer_tree_host_impl_->BeginNextFrame();
   }
 
@@ -675,7 +677,11 @@ bool LayerTreeHostImpl::CalculateRenderPasses(FrameData* frame) {
   return draw_frame;
 }
 
-void LayerTreeHostImpl::SetBackgroundTickingEnabled(bool enabled) {
+void LayerTreeHostImpl::UpdateBackgroundAnimateTicking() {
+  bool able_to_draw = visible_ && CanDraw();
+  bool enabled = !able_to_draw &&
+                 !animation_registrar_->active_animation_controllers().empty();
+
   // Lazily create the time_source adapter so that we can vary the interval for
   // testing.
   if (!time_source_client_adapter_) {
@@ -1035,7 +1041,6 @@ void LayerTreeHostImpl::DrawLayers(FrameData* frame,
         DidDrawDamagedArea();
   }
   active_tree_->root_layer()->ResetAllChangeTrackingForSubtree();
-  UpdateAnimationState();
 }
 
 void LayerTreeHostImpl::DidDrawAllLayers(const FrameData& frame) {
@@ -1240,10 +1245,6 @@ void LayerTreeHostImpl::SetVisible(bool visible) {
     return;
 
   renderer_->SetVisible(visible);
-
-  SetBackgroundTickingEnabled(
-      !visible_ &&
-      !animation_registrar_->active_animation_controllers().empty());
 }
 
 bool LayerTreeHostImpl::InitializeRenderer(
@@ -1815,9 +1816,6 @@ void LayerTreeHostImpl::AnimateLayers(base::TimeTicks monotonic_time,
     (*iter).second->Animate(monotonic_seconds);
 
   client_->SetNeedsRedrawOnImplThread();
-  SetBackgroundTickingEnabled(
-      !visible_ &&
-      !animation_registrar_->active_animation_controllers().empty());
 }
 
 void LayerTreeHostImpl::UpdateAnimationState() {