Added UMA statistics for changing the active window via click or touch events.

ui/wm/core/shadow_controller.h

 // Copyright (c) 2012 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 UI_WM_CORE_SHADOW_CONTROLLER_H_
 #define UI_WM_CORE_SHADOW_CONTROLLER_H_
 
 #include <map>
 
 #include "base/basictypes.h"
@@ skipping 33 matching lines @@
    private:
     ShadowController* controller_;  // not owned
 
     DISALLOW_COPY_AND_ASSIGN(TestApi);
   };
 
   explicit ShadowController(aura::client::ActivationClient* activation_client);
   ~ShadowController() override;
 
   // aura::client::ActivationChangeObserver overrides:
-  void OnWindowActivated(aura::Window* gained_active,
-                         aura::Window* lost_active) override;
+  void OnWindowActivated(
+      aura::client::ActivationChangeObserver::ActivationReason reason,
+      aura::Window* gained_active,
+      aura::Window* lost_active) override;
 
  private:
   class Impl;
 
   aura::client::ActivationClient* activation_client_;
 
   scoped_refptr<Impl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(ShadowController);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_SHADOW_CONTROLLER_H_