[Md Feedback] Add initial data population for dialog.

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

 // 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.
 
 #include "chrome/browser/ui/webui/md_feedback/md_feedback_ui.h"
 
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/webui/md_feedback/md_feedback_webui_message_handler.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_ui_data_source.h"
 #include "grit/browser_resources.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 #include "url/gurl.h"
 
 #if !defined(OS_MACOSX)
@@ skipping 79 matching lines @@
                                   IDS_MD_FEEDBACK_CANCEL_BUTTON);
   html_source->AddLocalizedString("sendReportButton",
                                   IDS_MD_FEEDBACK_SEND_REPORT_BUTTON);
 
   // Checkbox labels.
   html_source->AddLocalizedString("includeScreenshotLabel",
                                   IDS_MD_FEEDBACK_SCREENSHOT_LABEL);
   html_source->AddLocalizedString("sendSystemInfoLabel",
                                   IDS_MD_FEEDBACK_SEND_SYSTEM_INFO_LABEL);
 
+  // File resources.
+  html_source->AddResourcePath("feedback.js",
+        IDR_MD_FEEDBACK_FEEDBACK_JS);
+
   // Polymer resources.
   html_source->AddResourcePath("feedback_container.html",
         IDR_MD_FEEDBACK_FEEDBACK_CONTAINER_HTML);
   html_source->AddResourcePath("feedback_container.js",
         IDR_MD_FEEDBACK_FEEDBACK_CONTAINER_JS);
 
   html_source->SetJsonPath("strings.js");
   html_source->SetDefaultResource(IDR_MD_FEEDBACK_FEEDBACK_HTML);
   return html_source;
 }
 
 }  // namespace
 
 MdFeedbackUI::MdFeedbackUI(content::WebUI* web_ui)
-    : content::WebUIController(web_ui) {
+    : content::WebUIController(web_ui),
+      handler_(new MdFeedbackWebUIMessageHandler(this)) {

[afakhry, 2016/08/03 23:56:01]

You don't need that internal reference |handler_| at all. See an example here:
https://cs.chromium.org/chromium/src/chrome/browser/ui/webui/chromeos/keyboar...

[apacible, 2016/08/11 18:50:33]

Done.

   // Set up the chrome://feedback data html_source.
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource* html_source =
       CreateMdFeedbackUIHTMLSource(profile);
   content::WebUIDataSource::Add(profile, html_source);
+
+  // Ownership of |handler_| is transferred to |web_ui|.
+  web_ui->AddMessageHandler(handler_);
 }
 
 MdFeedbackUI::~MdFeedbackUI() {}
 
 void ShowFeedbackWebDialog(
     content::BrowserContext* browser_context) {
   // TODO(apacible): Platform dependent implementations.
 #if !defined(OS_MACOSX)
   // TODO(apacible): If a feedback dialog is already open, bring that dialog
   // to the front rather than creating a new dialog.
   chrome::ShowWebDialog(NULL, browser_context, new MdFeedbackDialogDelegate());
 #endif  // !OS_MACOSX
 }