Add UMA histogram to track the various sources that request the feedback app

chrome/browser/ui/ash/chrome_new_window_client.cc

 // Copyright 2013 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/ash/chrome_new_window_client.h"
 
 #include "ash/content/keyboard_overlay/keyboard_overlay_view.h"
 #include "ash/public/interfaces/constants.mojom.h"
 #include "base/macros.h"
 #include "chrome/browser/chromeos/file_manager/app_id.h"
@@ skipping 200 matching lines @@
   std::string url(chrome::kChromeUIKeyboardOverlayURL);
   ash::KeyboardOverlayView::ShowDialog(profile, new ChromeWebContentsHandler,
                                        GURL(url));
 }
 
 void ChromeNewWindowClient::ShowTaskManager() {
   chrome::OpenTaskManager(nullptr);
 }
 
 void ChromeNewWindowClient::OpenFeedbackPage() {
-  chrome::OpenFeedbackDialog(GetActiveBrowser());
+  chrome::OpenFeedbackDialog(GetActiveBrowser(), chrome::kFeedbackSourceAsh);
 }