Revert of Moving background animation ticking from LayerTreeHostImpl into the Scheduler.

cc/trees/single_thread_proxy.cc

Index: cc/trees/single_thread_proxy.cc
diff --git a/cc/trees/single_thread_proxy.cc b/cc/trees/single_thread_proxy.cc
index 94a6f2851c129f191776b57a31236a3970847bba..439304aa3179cf10f4ba91c255346ecdc43acb14 100644
--- a/cc/trees/single_thread_proxy.cc
+++ b/cc/trees/single_thread_proxy.cc
@@ -101,6 +101,7 @@
   if (scheduler_on_impl_thread_)
     scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
   // Changing visibility could change ShouldComposite().
+  UpdateBackgroundAnimateTicking();
 }
 
 void SingleThreadProxy::RequestNewOutputSurface() {
@@ -160,24 +161,6 @@
   SetNeedsCommit();
 }
 
-void SingleThreadProxy::DoAnimate() {
-  // Don't animate if there is no root layer.
-  // TODO(mithro): Both Animate and UpdateAnimationState already have a
-  // "!active_tree_->root_layer()" check?
-  if (!layer_tree_host_impl_->active_tree()->root_layer()) {
-    return;
-  }
-
-  layer_tree_host_impl_->Animate(
-      layer_tree_host_impl_->CurrentBeginFrameArgs().frame_time);
-
-  // If animations are not visible, update the animation state now as it
-  // won't happen in DoComposite.
-  if (!layer_tree_host_impl_->AnimationsAreVisible()) {
-    layer_tree_host_impl_->UpdateAnimationState(true);
-  }
-}
-
 void SingleThreadProxy::DoCommit() {
   TRACE_EVENT0("cc", "SingleThreadProxy::DoCommit");
   DCHECK(Proxy::IsMainThread());
@@ -218,6 +201,8 @@
     layer_tree_host_->FinishCommitOnImplThread(layer_tree_host_impl_.get());
 
     layer_tree_host_impl_->CommitComplete();
+
+    UpdateBackgroundAnimateTicking();
 
 #if DCHECK_IS_ON
     // In the single-threaded case, the scale and scroll deltas should never be
@@ -337,6 +322,7 @@
   TRACE_EVENT1(
       "cc", "SingleThreadProxy::OnCanDrawStateChanged", "can_draw", can_draw);
   DCHECK(Proxy::IsImplThread());
+  UpdateBackgroundAnimateTicking();
   if (scheduler_on_impl_thread_)
     scheduler_on_impl_thread_->SetCanDraw(can_draw);
 }
@@ -355,9 +341,7 @@
 }
 
 void SingleThreadProxy::SetNeedsAnimateOnImplThread() {
-  client_->ScheduleComposite();
-  if (scheduler_on_impl_thread_)
-    scheduler_on_impl_thread_->SetNeedsAnimate();
+  SetNeedsRedrawOnImplThread();
 }
 
 void SingleThreadProxy::SetNeedsManageTilesOnImplThread() {
@@ -430,6 +414,7 @@
                    weak_factory_.GetWeakPtr()));
   }
 
+  UpdateBackgroundAnimateTicking();
   timing_history_.DidActivateSyncTree();
 }
 
@@ -507,8 +492,6 @@
       layer_tree_host_impl_->SynchronouslyInitializeAllTiles();
     }
 
-    DoAnimate();
-
     LayerTreeHostImpl::FrameData frame;
     DoComposite(frame_begin_time, &frame);
 
@@ -548,6 +531,12 @@
   DCHECK(Proxy::IsImplThread());
   return layer_tree_host_impl_->visible() &&
          layer_tree_host_impl_->CanDraw();
+}
+
+void SingleThreadProxy::UpdateBackgroundAnimateTicking() {
+  DCHECK(Proxy::IsImplThread());
+  layer_tree_host_impl_->UpdateBackgroundAnimateTicking(
+      !ShouldComposite() && layer_tree_host_impl_->active_tree()->root_layer());
 }
 
 void SingleThreadProxy::ScheduleRequestNewOutputSurface() {
@@ -577,10 +566,15 @@
     // DrawLayers() depends on the result of PrepareToDraw(), it is guarded on
     // CanDraw() as well.
     if (!ShouldComposite()) {
+      UpdateBackgroundAnimateTicking();
       return DRAW_ABORTED_CANT_DRAW;
     }
 
     timing_history_.DidStartDrawing();
+
+    layer_tree_host_impl_->Animate(
+        layer_tree_host_impl_->CurrentBeginFrameArgs().frame_time);
+    UpdateBackgroundAnimateTicking();
 
     draw_result = layer_tree_host_impl_->PrepareToDraw(frame);
     draw_frame = draw_result == DRAW_SUCCESS;
@@ -742,8 +736,8 @@
 
 void SingleThreadProxy::ScheduledActionAnimate() {
   TRACE_EVENT0("cc", "ScheduledActionAnimate");
-  DebugScopedSetImplThread impl(this);
-  DoAnimate();
+  layer_tree_host_impl_->Animate(
+      layer_tree_host_impl_->CurrentBeginFrameArgs().frame_time);
 }
 
 void SingleThreadProxy::ScheduledActionUpdateVisibleTiles() {