Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/drm_window.cc

 // Copyright 2014 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/ozone/platform/drm/gpu/drm_window.h"
 
 #include <drm_fourcc.h>
 
 #include "base/time/time.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 64 matching lines @@
 }
 
 gfx::AcceleratedWidget DrmWindow::GetAcceleratedWidget() {
   return widget_;
 }
 
 HardwareDisplayController* DrmWindow::GetController() {
   return controller_;
 }
 
-void DrmWindow::OnBoundsChanged(const gfx::Rect& bounds) {
-  TRACE_EVENT2("drm", "DrmWindow::OnBoundsChanged", "widget", widget_, "bounds",
+void DrmWindow::SetBounds(const gfx::Rect& bounds) {
+  TRACE_EVENT2("drm", "DrmWindow::SetBounds", "widget", widget_, "bounds",
                bounds.ToString());
   bounds_ = bounds;
   if (bounds_.size() != bounds.size())
     last_submitted_planes_.clear();
 
   screen_manager_->UpdateControllerToWindowMapping();
 }
 
 void DrmWindow::SetCursor(const std::vector<SkBitmap>& bitmaps,
                           const gfx::Point& location,
@@ skipping 210 matching lines @@
       if (!cursor_buffers_[i]->Initialize(
               info, false /* should_register_framebuffer */)) {
         LOG(FATAL) << "Failed to initialize cursor buffer";
         return;
       }
     }
   }
 }
 
 }  // namespace ui