views/mus: Add a test to verify that Widget receives events correctly.

components/mus/public/cpp/window.h

 // 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.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 14 matching lines @@
 }
 
 namespace mus {
 
 class InputEventHandler;
 class ServiceProviderImpl;
 class WindowObserver;
 class WindowSurface;
 class WindowSurfaceBinding;
 class WindowTreeClientImpl;
+class WindowTreeClientImplPrivate;
 class WindowTreeConnection;
 
 namespace {
 class OrderChangedNotifier;
 }
 
 // Defined in window_property.h (which we do not include)
 template <typename T>
 struct WindowProperty;
 
@@ skipping 177 matching lines @@
   std::string GetName() const;
 
  protected:
   // This class is subclassed only by test classes that provide a public ctor.
   Window();
   ~Window();
 
  private:
   friend class WindowPrivate;
   friend class WindowTreeClientImpl;
+  friend class WindowTreeClientImplPrivate;
 
   Window(WindowTreeConnection* connection, Id id);
 
   // Used to identify this Window on the server. Clients can not change this
   // value.
   Id server_id() const { return server_id_; }
 
   WindowTreeClientImpl* tree_client();
 
   // Applies a shared property change locally and forwards to the server. If
@@ skipping 103 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_