Adding metrics on the usefulness of the Win10 version of the Welcome Page

chrome/browser/ui/webui/welcome_win10_handler.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 CHROME_BROWSER_UI_WEBUI_WELCOME_WIN10_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_WELCOME_WIN10_HANDLER_H_
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
 #include "base/timer/timer.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }
 
 // Handles actions on the Windows 10 specific Welcome page.
 class WelcomeWin10Handler : public content::WebUIMessageHandler {
  public:
-  WelcomeWin10Handler();
+  explicit WelcomeWin10Handler(bool inline_style_variant);
   ~WelcomeWin10Handler() override;
 
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
  private:
   // Handlers for javascript calls.
   void HandleGetPinnedToTaskbarState(const base::ListValue* args);
   void HandleSetDefaultBrowser(const base::ListValue* args);
   void HandleContinue(const base::ListValue* args);
@@ skipping 17 matching lines @@
   // Acts as a cache to hold the taskbar pinned state of Chrome. It has no value
   // until this state is determined.
   base::Optional<bool> pinned_state_result_;
 
   // The callback id used to return the result to the getPinnedToTaskbarState()
   // javascript call. This id is empty until we receive the call; thus this
   // variable is used to determine if the result should be sent to the caller
   // when it is received, or wait for the call to happen.
   std::string pinned_state_callback_id_;
 
+  // Indicates if the inline style variant is displayed.
+  bool inline_style_variant_;
+
   base::WeakPtrFactory<WelcomeWin10Handler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WelcomeWin10Handler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_WELCOME_WIN10_HANDLER_H_