cc: Allow sending BeginMainFrame before draw or activation

cc/trees/thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/trees/thread_proxy.h"
 
 #include <string>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 866 matching lines @@
   }
 
   layer_tree_host_->CommitComplete();
   layer_tree_host_->DidBeginFrame();
 }
 
 void ThreadProxy::StartCommitOnImplThread(
     CompletionEvent* completion,
     ResourceUpdateQueue* raw_queue,
     scoped_refptr<cc::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());
   DCHECK(scheduler_on_impl_thread_);
   DCHECK(scheduler_on_impl_thread_->CommitPending());
 
   if (!layer_tree_host_impl_) {
     TRACE_EVENT0("cc", "EarlyOut_NoLayerTree");
     completion->Signal();
     return;
   }
 
+  scoped_ptr<ResourceUpdateQueue> queue(raw_queue);
+
   if (offscreen_context_provider.get())
     offscreen_context_provider->BindToCurrentThread();
   layer_tree_host_impl_->SetOffscreenContextProvider(
       offscreen_context_provider);
 
   if (layer_tree_host_->contents_texture_manager()) {
     if (layer_tree_host_->contents_texture_manager()->
             LinkedEvictedBackingsExist()) {
       // Clear any uploads we were making to textures linked to evicted
       // resources
@@ skipping 400 matching lines @@
 }
 
 void ThreadProxy::InitializeImplOnImplThread(CompletionEvent* completion) {
   TRACE_EVENT0("cc", "ThreadProxy::InitializeImplOnImplThread");
   DCHECK(IsImplThread());
   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.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;
   scheduler_settings.maximum_number_of_failed_draws_before_draw_is_forced_ =
       settings.maximum_number_of_failed_draws_before_draw_is_forced_;
   scheduler_settings.using_synchronous_renderer_compositor =
       settings.using_synchronous_renderer_compositor;
   scheduler_settings.throttle_frame_production =
       settings.throttle_frame_production;
   scheduler_settings.use_begin_frame_workaround_for_crbug_249806 = true;
@@ skipping 229 matching lines @@
     completion_event_for_commit_held_on_tree_activation_ = NULL;
   }
 
   UpdateBackgroundAnimateTicking();
 
   commit_to_activate_duration_history_.InsertSample(
       base::TimeTicks::HighResNow() - commit_complete_time_);
 }
 
 }  // namespace cc