Implement hit tests/client area.

ui/views/mus/mus_client.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 "ui/views/mus/mus_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "services/service_manager/public/cpp/connection.h"
 #include "services/service_manager/public/cpp/connector.h"
@@ skipping 60 matching lines @@
     native_widget->SetDesktopWindowTreeHost(
         base::WrapUnique(init_params.desktop_window_tree_host));
   } else {
     native_widget->SetDesktopWindowTreeHost(
         base::MakeUnique<DesktopWindowTreeHostMus>(delegate, native_widget,
                                                    init_params));
   }
   return native_widget;
 }
 
+void MusClient::AddObserver(MusClientObserver* observer) {
+  observer_list_.AddObserver(observer);
+}
+
+void MusClient::RemoveObserver(MusClientObserver* observer) {
+  observer_list_.RemoveObserver(observer);
+}
+
 MusClient::MusClient(service_manager::Connector* connector,
                      const service_manager::Identity& identity,
                      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner)
     : connector_(connector), identity_(identity) {
   DCHECK(!instance_);
   instance_ = this;
   // TODO(msw): Avoid this... use some default value? Allow clients to extend?
   property_converter_ = base::MakeUnique<aura::PropertyConverter>();
 
   wm_state_ = base::MakeUnique<wm::WMState>();
@@ skipping 37 matching lines @@
 }
 
 void MusClient::OnPointerEventObserved(const ui::PointerEvent& event,
                                        aura::Window* target) {
   // TODO: wire up PointerWatcherEventRouter. http://crbug.com/663526.
   NOTIMPLEMENTED();
 }
 
 void MusClient::OnWindowManagerFrameValuesChanged() {
   // TODO: wire up client area. http://crbug.com/663525.
-  NOTIMPLEMENTED();
+  for (auto& observer : observer_list_)
+    observer.OnWindowManagerFrameValuesChanged();
 }
 
 aura::client::CaptureClient* MusClient::GetCaptureClient() {
   return wm::CaptureController::Get();
 }
 
 aura::PropertyConverter* MusClient::GetPropertyConverter() {
   return property_converter_.get();
 }
 
@@ skipping 13 matching lines @@
       return root->GetTopWindowContainingPoint(relative_point);
   }
   return nullptr;
 }
 
 std::unique_ptr<OSExchangeData::Provider> MusClient::BuildProvider() {
   return base::MakeUnique<aura::OSExchangeDataProviderMus>();
 }
 
 }  // namespace views