UMA stats for stylus usage

ash/mus/bridge/wm_window_mus.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 ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 #define ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_
 
 #include <memory>
 
 #include "ash/common/shell_window_ids.h"
@@ skipping 104 matching lines @@
   WmRootWindowController* GetRootWindowController() override;
   WmShell* GetShell() const override;
   void SetName(const char* name) override;
   std::string GetName() const override;
   void SetTitle(const base::string16& title) override;
   base::string16 GetTitle() const override;
   void SetShellWindowId(int id) override;
   int GetShellWindowId() const override;
   WmWindow* GetChildByShellWindowId(int id) override;
   ui::wm::WindowType GetType() const override;
+  int GetAppType() const override;
+  void SetAppType(int app_type) const override;
   bool IsBubble() override;
   ui::Layer* GetLayer() override;
   display::Display GetDisplayNearestWindow() override;
   bool HasNonClientArea() override;
   int GetNonClientComponent(const gfx::Point& location) override;
   gfx::Point ConvertPointToTarget(const WmWindow* target,
                                   const gfx::Point& point) const override;
   gfx::Point ConvertPointToScreen(const gfx::Point& point) const override;
   gfx::Point ConvertPointFromScreen(const gfx::Point& point) const override;
   gfx::Rect ConvertRectToScreen(const gfx::Rect& rect) const override;
@@ skipping 172 matching lines @@
 
   bool locked_to_root_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(WmWindowMus);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_WM_WINDOW_MUS_H_