mus: Add debug key to print the server window hierarchy

components/mus/ws/window_manager_state.h

 // 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.
 
 #ifndef COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 #define COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 135 matching lines @@
   // been processed it is dispatched, otherwise the event is passed to the
   // EventDispatcher for processing.
   void ProcessNextEventFromQueue();
 
   // Dispatches the event to the appropriate client and starts the ack timer.
   void DispatchInputEventToWindowImpl(ServerWindow* target,
                                       bool in_nonclient_area,
                                       const ui::Event& event,
                                       base::WeakPtr<Accelerator> accelerator);
 
+  // Handles debugging shortcuts in debug builds. The events are not consumed.
+  void RunDebugShortcuts(const ui::Event& event);
+
   // EventDispatcherDelegate:
   void OnAccelerator(uint32_t accelerator_id, const ui::Event& event) override;
   void SetFocusedWindowFromEventDispatcher(ServerWindow* window) override;
   ServerWindow* GetFocusedWindowForEventDispatcher() override;
   void SetNativeCapture() override;
   void ReleaseNativeCapture() override;
   void OnServerWindowCaptureLost(ServerWindow* window) override;
   void OnMouseCursorLocationChanged(const gfx::Point& point) override;
   void DispatchInputEventToWindow(ServerWindow* target,
                                   bool in_nonclient_area,
@@ skipping 25 matching lines @@
 
   EventDispatcher event_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerState);
 };
 
 }  // namespace ws
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_WS_WINDOW_MANAGER_STATE_H_