Added an ActivationReason parameter to ActivationChangeObserver::OnWindowActivated(...).

chrome/browser/ui/views/extensions/extension_popup_aura.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 CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_POPUP_AURA_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_POPUP_AURA_H_
 
 #include "chrome/browser/ui/views/extensions/extension_popup.h"
 #include "ui/wm/public/activation_change_observer.h"
 
 class ExtensionPopupAura : public ExtensionPopup,
                            public aura::client::ActivationChangeObserver {
  public:
   ExtensionPopupAura(extensions::ExtensionViewHost* host,
                      views::View* anchor_view,
                      views::BubbleBorder::Arrow arrow,
                      ShowAction show_action);
   ~ExtensionPopupAura() override;
 
   // views::WidgetObserver overrides.
   void OnWidgetDestroying(views::Widget* widget) 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:
   DISALLOW_COPY_AND_ASSIGN(ExtensionPopupAura);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_POPUP_AURA_H_