mash: Don't draw the window title under chrome tabs.

mash/wm/non_client_frame_controller.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 MASH_WM_NON_CLIENT_FRAME_CONTROLLER_H_
 #define MASH_WM_NON_CLIENT_FRAME_CONTROLLER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 40 matching lines @@
                            mus::Window* window,
                            mus::WindowManagerClient* window_manager_client);
   ~NonClientFrameController() override;
 
   // views::WidgetDelegateView:
   base::string16 GetWindowTitle() const override;
   views::View* GetContentsView() override;
   bool CanResize() const override;
   bool CanMaximize() const override;
   bool CanMinimize() const override;
+  bool ShouldShowWindowTitle() const override;
   views::ClientView* CreateClientView(views::Widget* widget) override;
 
   // mus::WindowObserver:
   void OnWindowSharedPropertyChanged(
       mus::Window* window,
       const std::string& name,
       const std::vector<uint8_t>* old_data,
       const std::vector<uint8_t>* new_data) override;
   void OnWindowDestroyed(mus::Window* window) override;
 
   views::Widget* widget_;
 
   // WARNING: as widget delays destruction there is a portion of time when this
   // is null.
   mus::Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(NonClientFrameController);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_NON_CLIENT_FRAME_CONTROLLER_H_