cc: Implement deadine scheduling disabled by default

cc/trees/thread_proxy.cc

Index: cc/trees/thread_proxy.cc
diff --git a/cc/trees/thread_proxy.cc b/cc/trees/thread_proxy.cc
index 5c6533a43745501937d9987bf48cff0cd98263ef..b8799d5be730e1191293cf9ed178230d26fbb296 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -80,6 +80,7 @@ ThreadProxy::ThreadProxy(
       inside_commit_(false),
       weak_factory_on_impl_thread_(this),
       weak_factory_(this),
+      frame_did_draw_(false),
       begin_frame_sent_to_main_thread_completion_event_on_impl_thread_(NULL),
       readback_request_on_impl_thread_(NULL),
       commit_completion_event_on_impl_thread_(NULL),
@@ -397,14 +398,35 @@ void ThreadProxy::SetNeedsBeginFrameOnImplThread(bool enable) {
   TRACE_EVENT1("cc", "ThreadProxy::SetNeedsBeginFrameOnImplThread",
                "enable", enable);
   layer_tree_host_impl_->SetNeedsBeginFrame(enable);
+  UpdateBackgroundAnimateTicking();
 }
 
 void ThreadProxy::BeginFrameOnImplThread(const BeginFrameArgs& args) {
   DCHECK(IsImplThread());
   TRACE_EVENT0("cc", "ThreadProxy::BeginFrameOnImplThread");
+
+  base::TimeTicks monotonic_time =
+      layer_tree_host_impl_->CurrentFrameTimeTicks();
+  base::Time wall_clock_time = layer_tree_host_impl_->CurrentFrameTime();
+  if (layer_tree_host_impl_->active_tree()->root_layer())
+    layer_tree_host_impl_->Animate(monotonic_time, wall_clock_time);
+
+  // Reinitialize for the current frame.
+  frame_did_draw_ = false;
+
   scheduler_on_impl_thread_->BeginFrame(args);
 }
 
+void ThreadProxy::DidBeginFrameDeadlineOnImplThread() {
+  // Do not start animations if we skip drawing the frame to avoid
+  // checkerboarding.
+  if (layer_tree_host_impl_->active_tree()->root_layer()) {
+    layer_tree_host_impl_->UpdateAnimationState(
+        frame_did_draw_ || !layer_tree_host_impl_->CanDraw());
+  }
+  layer_tree_host_impl_->ResetCurrentFrameTimeForNextFrame();
+}
+
 void ThreadProxy::OnCanDrawStateChanged(bool can_draw) {
   DCHECK(IsImplThread());
   TRACE_EVENT1(
@@ -976,6 +998,10 @@ void ThreadProxy::ScheduledActionCommit() {
   begin_frame_to_commit_duration_history_.InsertSample(
       commit_complete_time_ - begin_frame_sent_to_main_thread_time_);
 
+  // The commit may have added animations, requiring us to start
+  // background ticking.
+  UpdateBackgroundAnimateTicking();
+
   // SetVisible kicks off the next scheduler action, so this must be last.
   scheduler_on_impl_thread_->SetVisible(layer_tree_host_impl_->visible());
 }
@@ -1018,16 +1044,6 @@ DrawSwapReadbackResult ThreadProxy::DrawSwapReadbackInternal(
   if (!layer_tree_host_impl_->renderer())
     return result;
 
-  base::TimeTicks monotonic_time =
-      layer_tree_host_impl_->CurrentFrameTimeTicks();
-  base::Time wall_clock_time = layer_tree_host_impl_->CurrentFrameTime();
-
-  // TODO(enne): This should probably happen post-animate.
-  if (layer_tree_host_impl_->pending_tree())
-    layer_tree_host_impl_->pending_tree()->UpdateDrawProperties();
-  layer_tree_host_impl_->Animate(monotonic_time, wall_clock_time);
-  UpdateBackgroundAnimateTicking();
-
   base::TimeTicks start_time = base::TimeTicks::HighResNow();
   base::TimeDelta draw_duration_estimate = DrawDurationEstimate();
   base::AutoReset<bool> mark_inside(&inside_draw_, true);
@@ -1043,15 +1059,12 @@ DrawSwapReadbackResult ThreadProxy::DrawSwapReadbackInternal(
   // DrawLayers() depends on the result of PrepareToDraw(), it is guarded on
   // CanDraw() as well.
 
-  // readback_request_on_impl_thread_ may be for the pending tree, do
-  // not perform the readback unless explicitly requested.
   bool drawing_for_readback =
       readback_requested && !!readback_request_on_impl_thread_;
   bool can_do_readback = layer_tree_host_impl_->renderer()->CanReadPixels();
 
   LayerTreeHostImpl::FrameData frame;
   bool draw_frame = false;
-  bool start_ready_animations = true;
 
   if (layer_tree_host_impl_->CanDraw() &&
       (!drawing_for_readback || can_do_readback)) {
@@ -1060,15 +1073,13 @@ DrawSwapReadbackResult ThreadProxy::DrawSwapReadbackInternal(
     if (drawing_for_readback)
       readback_rect = readback_request_on_impl_thread_->rect;
 
-    // Do not start animations if we skip drawing the frame to avoid
-    // checkerboarding.
     if (layer_tree_host_impl_->PrepareToDraw(&frame, readback_rect) ||
         forced_draw)
       draw_frame = true;
-    else
-      start_ready_animations = false;
   }
 
+  frame_did_draw_ = draw_frame;
+
   if (draw_frame) {
     layer_tree_host_impl_->DrawLayers(
         &frame,
@@ -1076,7 +1087,6 @@ DrawSwapReadbackResult ThreadProxy::DrawSwapReadbackInternal(
     result.did_draw = true;
   }
   layer_tree_host_impl_->DidDrawAllLayers(frame);
-  layer_tree_host_impl_->UpdateAnimationState(start_ready_animations);
 
   // Check for a pending CompositeAndReadback.
   if (drawing_for_readback) {
@@ -1216,9 +1226,8 @@ DrawSwapReadbackResult ThreadProxy::ScheduledActionDrawAndReadback() {
 
 void ThreadProxy::DidAnticipatedDrawTimeChange(base::TimeTicks time) {
   if (current_resource_update_controller_on_impl_thread_)
-    current_resource_update_controller_on_impl_thread_
-        ->PerformMoreUpdates(time);
-  layer_tree_host_impl_->ResetCurrentFrameTimeForNextFrame();
+    current_resource_update_controller_on_impl_thread_->PerformMoreUpdates(
+        time);
 }
 
 base::TimeDelta ThreadProxy::DrawDurationEstimate() {
@@ -1239,6 +1248,14 @@ base::TimeDelta ThreadProxy::CommitToActivateDurationEstimate() {
       kCommitAndActivationDurationEstimationPercentile);
 }
 
+void ThreadProxy::PostBeginFrameDeadline(const base::Closure& closure,
+                                         base::TimeTicks deadline) {
+  base::TimeDelta delta = deadline - base::TimeTicks::Now();
+  if (delta <= base::TimeDelta())
+    delta = base::TimeDelta();
+  Proxy::ImplThreadTaskRunner()->PostDelayedTask(FROM_HERE, closure, delta);
+}
+
 void ThreadProxy::ReadyToFinalizeTextureUpdates() {
   DCHECK(IsImplThread());
   scheduler_on_impl_thread_->FinishCommit();
@@ -1309,6 +1326,8 @@ void ThreadProxy::InitializeImplOnImplThread(CompletionEvent* completion) {
   layer_tree_host_impl_ = layer_tree_host_->CreateLayerTreeHostImpl(this);
   const LayerTreeSettings& settings = layer_tree_host_->settings();
   SchedulerSettings scheduler_settings;
+  scheduler_settings.deadline_scheduling_enabled =
+      settings.deadline_scheduling_enabled;
   scheduler_settings.impl_side_painting = settings.impl_side_painting;
   scheduler_settings.timeout_and_draw_when_animation_checkerboards =
       settings.timeout_and_draw_when_animation_checkerboards;