Get signals working in the EXTRA_DATA section of MHTML

chrome/browser/android/offline_pages/offline_page_mhtml_archiver.cc

 // Copyright 2015 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/android/offline_pages/offline_page_mhtml_archiver.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 35 matching lines @@
     : web_contents_(nullptr),
       weak_ptr_factory_(this) {
 }
 
 OfflinePageMHTMLArchiver::~OfflinePageMHTMLArchiver() {
 }
 
 void OfflinePageMHTMLArchiver::CreateArchive(
     const base::FilePath& archives_dir,
     const CreateArchiveParams& create_archive_params,
+    const std::string& signal_data,
     const CreateArchiveCallback& callback) {
   DCHECK(callback_.is_null());
   DCHECK(!callback.is_null());
   callback_ = callback;
+  signal_data_ = signal_data;
 
   if (HasConnectionSecurityError()) {
     ReportFailure(ArchiverResult::ERROR_SECURITY_CERTIFICATE);
     return;
   }
 
   GenerateMHTML(archives_dir, create_archive_params);
 }
 
 void OfflinePageMHTMLArchiver::GenerateMHTML(
@@ skipping 20 matching lines @@
   // TODO(fgorski): Figure out if the actual URL can be different at
   // the end of MHTML generation. Perhaps we should pull it out after the MHTML
   // is generated.
   GURL url(web_contents_->GetLastCommittedURL());
   base::string16 title(web_contents_->GetTitle());
   base::FilePath file_path(
       archives_dir.Append(base::GenerateGUID()).AddExtension(kMHTMLExtension));
   content::MHTMLGenerationParams params(file_path);
   params.use_binary_encoding = true;
   params.remove_popup_overlay = create_archive_params.remove_popup_overlay;
+  params.extra_data = signal_data_;
 
   web_contents_->GenerateMHTML(
       params,
       base::Bind(&OfflinePageMHTMLArchiver::OnGenerateMHTMLDone,
                  weak_ptr_factory_.GetWeakPtr(), url, file_path, title));
 }
 
 void OfflinePageMHTMLArchiver::OnGenerateMHTMLDone(
     const GURL& url,
     const base::FilePath& file_path,
@@ skipping 24 matching lines @@
 }
 
 void OfflinePageMHTMLArchiver::ReportFailure(ArchiverResult result) {
   DCHECK(result != ArchiverResult::SUCCESSFULLY_CREATED);
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE, base::Bind(callback_, this, result, GURL(), base::FilePath(),
                             base::string16(), 0));
 }
 
 }  // namespace offline_pages