[MD Feedback] Add placeholder feedback entry point.

chrome/browser/ui/webui/md_feedback/md_feedback_dialog_controller.h

Index: chrome/browser/ui/webui/md_feedback/md_feedback_dialog_controller.h
diff --git a/chrome/browser/ui/webui/md_feedback/md_feedback_dialog_controller.h b/chrome/browser/ui/webui/md_feedback/md_feedback_dialog_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..c1a0c9a72b6ec873713d1d041d547ba92a6973ef
--- /dev/null
+++ b/chrome/browser/ui/webui/md_feedback/md_feedback_dialog_controller.h
@@ -0,0 +1,23 @@
+// 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_MD_FEEDBACK_MD_FEEDBACK_DIALOG_CONTROLLER_H_
+#define CHROME_BROWSER_UI_WEBUI_MD_FEEDBACK_MD_FEEDBACK_DIALOG_CONTROLLER_H_
+
+#include "content/public/browser/browser_context.h"
+
+class MdFeedbackDialogController {

[afakhry, 2016/08/02 22:15:56]

Please document your class, its responsibility and its key functions like
Show().

[apacible, 2016/08/09 22:11:14]

Done.

+ public:
+  ~MdFeedbackDialogController();

[afakhry, 2016/08/02 22:15:56]

You can just say 
~MdFeedbackDialogController() = default; 
And get rid of the empty implementation in the cc file.

[apacible, 2016/08/09 22:11:14]

Done.

+
+  static MdFeedbackDialogController* GetOrCreate();
+  void Show(content::BrowserContext* browser_context);
+
+ private:
+  MdFeedbackDialogController();
+
+  DISALLOW_COPY_AND_ASSIGN(MdFeedbackDialogController);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_MD_FEEDBACK_MD_FEEDBACK_DIALOG_CONTROLLER_H_