cc: Allow sending BeginMainFrame before draw or activation

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 e60a29dc48cfe1f007881c85e917875a19cce1fb..fc01e729ef132cc188b206878c80c2493e185329 100644
--- a/cc/trees/thread_proxy.cc
+++ b/cc/trees/thread_proxy.cc
@@ -940,8 +940,6 @@ void ThreadProxy::StartCommitOnImplThread(
     CompletionEvent* completion,
     ResourceUpdateQueue* raw_queue,
     scoped_refptr<ContextProvider> offscreen_context_provider) {
-  scoped_ptr<ResourceUpdateQueue> queue(raw_queue);
-
   TRACE_EVENT0("cc", "ThreadProxy::StartCommitOnImplThread");
   DCHECK(!commit_completion_event_on_impl_thread_);
   DCHECK(IsImplThread() && IsMainThreadBlocked());
@@ -954,6 +952,8 @@ void ThreadProxy::StartCommitOnImplThread(
     return;
   }
 
+  scoped_ptr<ResourceUpdateQueue> queue(raw_queue);
+
   if (offscreen_context_provider.get())
     offscreen_context_provider->BindToCurrentThread();
   layer_tree_host_impl_->SetOffscreenContextProvider(
@@ -1395,6 +1395,10 @@ void ThreadProxy::InitializeImplOnImplThread(CompletionEvent* completion) {
   SchedulerSettings scheduler_settings;
   scheduler_settings.deadline_scheduling_enabled =
       settings.deadline_scheduling_enabled;
+  scheduler_settings.start_commit_before_draw_enabled =
+      settings.start_commit_before_draw_enabled;
+  scheduler_settings.start_commit_before_activate_enabled =
+      settings.start_commit_before_activate_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;