Add a histogram "Download.FeedbackDialogEnabled"

chrome/browser/ui/views/download/download_feedback_dialog_view.cc

 // Copyright 2014 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/views/download/download_feedback_dialog_view.h"
 
+#include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/supports_user_data.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/views/constrained_window_views.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/views/controls/message_box_view.h"
 #include "ui/views/widget/widget.h"
 
 namespace {
@@ skipping 68 matching lines @@
 }
 
 bool DownloadFeedbackDialogView::OnButtonClicked(bool accepted) {
   profile_->GetPrefs()->SetBoolean(prefs::kSafeBrowsingDownloadFeedbackEnabled,
                                    accepted);
   DialogStatusData* data =
      static_cast<DialogStatusData*>(profile_->GetUserData(kDialogStatusKey));
   DCHECK(data);
   data->set_currently_shown(false);
 
+  UMA_HISTOGRAM_BOOLEAN("Download.FeedbackDialogEnabled", accepted);
+
   callback_.Run(accepted);
   return true;
 }
 
 bool DownloadFeedbackDialogView::Cancel() {
   return OnButtonClicked(false);
 }
 
 bool DownloadFeedbackDialogView::Accept() {
   return OnButtonClicked(true);
@@ skipping 15 matching lines @@
   return explanation_box_view_->GetWidget();
 }
 
 const views::Widget* DownloadFeedbackDialogView::GetWidget() const {
   return explanation_box_view_->GetWidget();
 }
 
 views::View* DownloadFeedbackDialogView::GetContentsView() {
   return explanation_box_view_;
 }