cc: Control activation from the Scheduler

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 955ce252eb1101dae960a4d23260bcdbbc305200..c717608aa666b1be1ff266ecb50a35bd5442cc97 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -410,11 +410,20 @@ void ThreadProxy::OnCanDrawStateChanged(bool can_draw) {
       !scheduler_on_impl_thread_->WillDrawIfNeeded());
 }
 
+void ThreadProxy::NotifyReadyToActivate() {
+  TRACE_EVENT0("cc", "ThreadProxy::NotifyReadyToActivate");
+  scheduler_on_impl_thread_->NotifyReadyToActivate();
+}
+
 void ThreadProxy::OnHasPendingTreeStateChanged(bool has_pending_tree) {
   DCHECK(IsImplThread());
   TRACE_EVENT1("cc", "ThreadProxy::OnHasPendingTreeStateChanged",
                "has_pending_tree", has_pending_tree);
-  scheduler_on_impl_thread_->SetHasPendingTree(has_pending_tree);
+  scheduler_on_impl_thread_->SetHasTrees(
+      has_pending_tree,
+      layer_tree_host_impl_->active_tree()
+          ? !layer_tree_host_impl_->active_tree()->root_layer()
+          : true);
 }
 
 void ThreadProxy::SetNeedsCommitOnImplThread() {
@@ -966,10 +975,10 @@ void ThreadProxy::ScheduledActionUpdateVisibleTiles() {
   layer_tree_host_impl_->UpdateVisibleTiles();
 }
 
-void ThreadProxy::ScheduledActionActivatePendingTreeIfNeeded() {
+void ThreadProxy::ScheduledActionActivatePendingTree() {
   DCHECK(IsImplThread());
-  TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionActivatePendingTreeIfNeeded");
-  layer_tree_host_impl_->ActivatePendingTreeIfNeeded();
+  TRACE_EVENT0("cc", "ThreadProxy::ScheduledActionActivatePendingTree");
+  layer_tree_host_impl_->ActivatePendingTree();
 }
 
 void ThreadProxy::ScheduledActionBeginOutputSurfaceCreation() {