Determine the Win10-specific Welcome page variant to display

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 <memory>
+#include <string>
+
 #include "base/macros.h"
+#include "base/timer/timer.h"
+#include "chrome/common/shell_handler_win.mojom.h"
+#include "content/public/browser/utility_process_mojo_client.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();
   ~WelcomeWin10Handler() override;
 
   // content::WebUIMessageHandler:
   void RegisterMessages() override;
 
  private:
+  // Handlers for javascript calls.
+  void HandleIsPinnedToTaskbar(const base::ListValue* args);
   void HandleSetDefaultBrowser(const base::ListValue* args);
   void HandleContinue(const base::ListValue* args);
 
+  // Called when the pinned state is received from the utility process.

[tmartino, 2016/10/28 15:18:04]

The relationship between this method and OnIsPinnedToTaskbarDetermined isn't
clear to me from the documentation. Could you address that point directly?

[Patrick Monette, 2016/10/28 21:21:37]

Done.

+  void OnIsPinnedToTaskbarResult(const std::string& callback_id,
+                                 bool succeeded,
+                                 bool is_pinned_to_taskbar);
+
+  // Returns the |is_pinned_to_taskbar| state to the calling javascript via
+  // the promise.
+  void OnIsPinnedToTaskbarDetermined(const std::string& callback_id,
+                                     bool is_pinned_to_taskbar);
+
+  std::unique_ptr<content::UtilityProcessMojoClient<mojom::ShellHandler>>
+      client_;
+  base::OneShotTimer timer_;
+
   DISALLOW_COPY_AND_ASSIGN(WelcomeWin10Handler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_WELCOME_WIN10_HANDLER_H_