Add internals page for DICE

chrome/browser/ui/webui/signin/signin_dice_internals_handler.h

Index: chrome/browser/ui/webui/signin/signin_dice_internals_handler.h
diff --git a/chrome/browser/ui/webui/signin/signin_dice_internals_handler.h b/chrome/browser/ui/webui/signin/signin_dice_internals_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9230a82f9f1c60c90f60c3173bb365cc0166063
--- /dev/null
+++ b/chrome/browser/ui/webui/signin/signin_dice_internals_handler.h
@@ -0,0 +1,33 @@
+// Copyright 2017 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_SIGNIN_SIGNIN_DICE_INTERNALS_HANDLER_H_
+#define CHROME_BROWSER_UI_WEBUI_SIGNIN_SIGNIN_DICE_INTERNALS_HANDLER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/web_ui_message_handler.h"
+
+namespace base {
+class ListValue;
+}
+class Profile;
+
+class SigninDiceInternalsHandler : public content::WebUIMessageHandler {
+ public:
+  explicit SigninDiceInternalsHandler(Profile* profile);
+  ~SigninDiceInternalsHandler() override;
+
+  // content::WebUIMessageHandler:
+  void RegisterMessages() override;
+
+ private:
+  // Handler for enable sync event.
+  void HandleEnableSync(const base::ListValue* args);
+
+  Profile* profile_;
+
+  DISALLOW_COPY_AND_ASSIGN(SigninDiceInternalsHandler);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_SIGNIN_DICE_INTERNALS_HANDLER_H_