Adds GetDisplays() to WindowManager

components/mus/example/wm/window_manager_impl.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_MUS_EXAMPLE_WM_WINDOW_MANAGER_IMPL_H_
 #define COMPONENTS_MUS_EXAMPLE_WM_WINDOW_MANAGER_IMPL_H_
 
 #include "base/macros.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
 
 class WindowManagerApplication;
 
 class WindowManagerImpl : public mus::mojom::WindowManager {
  public:
    WindowManagerImpl(WindowManagerApplication* state,
                      mojo::InterfaceRequest<mus::mojom::WindowManager> request);
    ~WindowManagerImpl() override;
 
  private:
   // mus::mojom::WindowManager:
   void OpenWindow(mojo::ViewTreeClientPtr client) override;
   void CenterWindow(uint32_t view_id, mojo::SizePtr size) override;
+  void GetDisplays(const GetDisplaysCallback& callback) override;
 
   WindowManagerApplication* state_;
   mojo::StrongBinding<mus::mojom::WindowManager> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerImpl);
 };
 
 #endif  // COMPONENTS_MUS_EXAMPLE_WM_WINDOW_MANAGER_IMPL_H_