Aura: Make compositor_unittests work with --ui-enable-threaded-compositing

ui/aura/root_window.cc

 // Copyright (c) 2012 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 "ui/aura/root_window.h"
 
 #include <vector>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
@@ skipping 529 matching lines @@
 ui::EventTarget* RootWindow::GetParentTarget() {
   return client::GetEventClient(this) ?
       client::GetEventClient(this)->GetToplevelEventTarget() :
           Env::GetInstance();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindow, ui::CompositorDelegate implementation:
 
 void RootWindow::ScheduleDraw() {
+  DCHECK(!ui::Compositor::WasInitializedWithThread());
   if (!defer_draw_scheduling_) {
     defer_draw_scheduling_ = true;
     MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&RootWindow::Draw, schedule_paint_factory_.GetWeakPtr()));
   }
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RootWindow, ui::CompositorObserver implementation:
@@ skipping 621 matching lines @@
 }
 
 gfx::Transform RootWindow::GetInverseRootTransform() const {
   float scale = ui::GetDeviceScaleFactor(layer());
   gfx::Transform transform;
   transform.Scale(1.0f / scale, 1.0f / scale);
   return transformer_->GetInverseTransform() * transform;
 }
 
 }  // namespace aura