[Md Feedback] Add initial data population for dialog.

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

Index: chrome/browser/ui/webui/md_feedback/md_feedback_ui.h
diff --git a/chrome/browser/ui/webui/md_feedback/md_feedback_ui.h b/chrome/browser/ui/webui/md_feedback/md_feedback_ui.h
index 202a6edaae32f4feb09a4b269d830c470607dcf6..5da469a090d8a490ecb9920976fcc8ed1fce0feb 100644
--- a/chrome/browser/ui/webui/md_feedback/md_feedback_ui.h
+++ b/chrome/browser/ui/webui/md_feedback/md_feedback_ui.h
@@ -12,12 +12,18 @@ namespace content {
 class BrowserContext;
 }  // namespace content
 
+class MdFeedbackWebUIMessageHandler;
+
 // The WebUI for chrome://feedback.
 class MdFeedbackUI : public content::WebUIController {
  public:
   explicit MdFeedbackUI(content::WebUI* web_ui);
   ~MdFeedbackUI() override;
  private:
+  // Owned by the |web_ui| passed in the ctor, and guaranteed to be deleted
+  // only after it has deleted |this|.
+  MdFeedbackWebUIMessageHandler* handler_;
+
   DISALLOW_COPY_AND_ASSIGN(MdFeedbackUI);
 };