[Android Downloads] Long-press menu item "Download Link" should delegate job to OfflinePages backen…

content/browser/download/download_resource_handler.cc

 // Copyright (c) 2012 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 "content/browser/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 178 matching lines @@
 void DownloadResourceHandler::ResumeRequest() {
   core_.ResumeRequest();
 }
 
 void DownloadResourceHandler::OnStart(
     std::unique_ptr<DownloadCreateInfo> create_info,
     std::unique_ptr<ByteStreamReader> stream_reader,
     const DownloadUrlParameters::OnStartedCallback& callback) {
   // If the user cancels the download, then don't call start. Instead ignore the
   // download entirely.
-  if (create_info->result == DOWNLOAD_INTERRUPT_REASON_USER_CANCELED &&
-      create_info->download_id == DownloadItem::kInvalidId) {
+  bool download_canceled =
+      create_info->result == DOWNLOAD_INTERRUPT_REASON_USER_CANCELED &&
+      create_info->download_id == DownloadItem::kInvalidId;
+  // Also don't start a download if it has to be handed off to OfflinePages.
+  download_canceled = download_canceled ||
+      create_info->result == DOWNLOAD_INTERRUPT_REASON_PAGE_DOWNLOAD_HANDOFF;
+  if (download_canceled) {
     if (!callback.is_null())
       BrowserThread::PostTask(
           BrowserThread::UI, FROM_HERE,
           base::Bind(callback, nullptr, create_info->result));
     return;
   }
 
   const ResourceRequestInfoImpl* request_info = GetRequestInfo();
   create_info->has_user_gesture = request_info->HasUserGesture();
   create_info->transition_type = request_info->GetPageTransition();
@@ skipping 40 matching lines @@
                             " }",
                             request() ?
                                 request()->url().spec().c_str() :
                                 "<NULL request>",
                             info->GetChildID(),
                             info->GetRequestID(),
                             info->GetRouteID());
 }
 
 }  // namespace content