Aura-Mus: Implement gutter in the embedder.

ui/aura/mus/window_tree_client.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/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1676 matching lines @@
   const ui::mojom::EventResult result = window_manager_delegate_->OnAccelerator(
       accelerator_id, *event.get(), &properties);
   if (ack_id && window_manager_internal_client_)
     window_manager_internal_client_->OnAcceleratorAck(ack_id, result,
                                                       properties);
 }
 
 void WindowTreeClient::SetFrameDecorationValues(
     ui::mojom::FrameDecorationValuesPtr values) {
   if (window_manager_internal_client_) {
+    normal_client_area_insets_ = values->normal_client_area_insets;
     window_manager_internal_client_->WmSetFrameDecorationValues(
         std::move(values));
   }
 }
 
 void WindowTreeClient::SetNonClientCursor(Window* window,
                                           ui::mojom::CursorType cursor_id) {
   if (window_manager_internal_client_) {
     window_manager_internal_client_->WmSetNonClientCursor(
         WindowMus::Get(window)->server_id(), cursor_id);
@@ skipping 253 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura