Add second copy request after screen rotation to flatten the layers in animation.

ash/display/display_configuration_controller.cc

 // Copyright 2016 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 "ash/display/display_configuration_controller.h"
 
 #include "ash/display/display_animator.h"
 #include "ash/display/display_animator_chromeos.h"
 #include "ash/display/display_util.h"
 #include "ash/rotator/screen_rotation_animator.h"
@@ skipping 115 matching lines @@
   } else {
     SetPrimaryDisplayIdImpl(display_id);
   }
 }
 
 void DisplayConfigurationController::OnDisplayConfigurationChanged() {
   // TODO(oshima): Stop all animations.
   SetThrottleTimeout(kAfterDisplayChangeThrottleTimeoutMs);
 }
 
-void DisplayConfigurationController::OnScreenRotationAnimationFinished(
-    ScreenRotationAnimator* screen_rotation_animator) {
-  const int64_t display_id = screen_rotation_animator->display_id();
-
-  DCHECK(rotation_animator_map_.count(display_id));
-
-  screen_rotation_animator->RemoveScreenRotationAnimatorObserver(this);
-  rotation_animator_map_.erase(screen_rotation_animator->display_id());
-}
-
 // Protected
 
 void DisplayConfigurationController::ResetAnimatorForTest() {
   if (!display_animator_)
     return;
   display_animator_.reset();
 }
 
 // Private
 
@@ skipping 27 matching lines @@
 }
 
 ScreenRotationAnimator*
 DisplayConfigurationController::GetScreenRotationAnimatorForDisplay(
     int64_t display_id) {
   auto iter = rotation_animator_map_.find(display_id);
   if (iter != rotation_animator_map_.end())
     return iter->second.get();
 
   auto animator = base::MakeUnique<ScreenRotationAnimator>(display_id);
-  animator->AddScreenRotationAnimatorObserver(this);
   ScreenRotationAnimator* result = animator.get();
   rotation_animator_map_.insert(
       std::make_pair(display_id, std::move(animator)));
   return result;
 }
 
 }  // namespace ash