Provide a better way of injecting extra diagnostics in feedbacks

chrome/browser/ui/sad_tab.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/sad_tab.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/net/referrer.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 213 matching lines @@
     case Action::BUTTON:
       RecordEvent(show_feedback_button_,
                   ui_metrics::SadTabEvent::BUTTON_CLICKED);
       if (show_feedback_button_) {
         ShowFeedbackPage(
             FindBrowserWithWebContents(web_contents_),
             kFeedbackSourceSadTabPage,
             l10n_util::GetStringUTF8(kind_ == SAD_TAB_KIND_CRASHED
                                          ? IDS_CRASHED_TAB_FEEDBACK_MESSAGE
                                          : IDS_KILLED_TAB_FEEDBACK_MESSAGE),
-            std::string(kCategoryTagCrash));
+            std::string(kCategoryTagCrash), std::string());
       } else {
         web_contents_->GetController().Reload(content::ReloadType::NORMAL,
                                               true);
       }
       break;
     case Action::HELP_LINK:
       RecordEvent(show_feedback_button_,
                   ui_metrics::SadTabEvent::HELP_LINK_CLICKED);
       content::OpenURLParams params(GURL(GetHelpLinkURL()), content::Referrer(),
                                     WindowOpenDisposition::CURRENT_TAB,
@@ skipping 27 matching lines @@
     // Fall through
     case chrome::SAD_TAB_KIND_KILLED:
       UMA_SAD_TAB_COUNTER("Tabs.SadTab.KillCreated");
       LOG(WARNING) << "Tab Killed: "
                    << web_contents->GetURL().GetOrigin().spec();
       break;
   }
 }
 
 }  // namespace chrome