Add UMA for measuring Content-Dispostion header use and abuse.

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/logging.h"
@@ skipping 140 matching lines @@
 
   info->url_chain = request_->url_chain();
   info->referrer_url = GURL(request_->referrer());
   info->start_time = base::Time::Now();
   info->total_bytes = content_length_;
   info->has_user_gesture = request_info->HasUserGesture();
   info->content_disposition = content_disposition_;
   info->mime_type = response->head.mime_type;
   info->remote_address = request_->GetSocketAddress().host();
   RecordDownloadMimeType(info->mime_type);
+  RecordDownloadContentDisposition(info->content_disposition);
 
   info->request_handle =
       DownloadRequestHandle(AsWeakPtr(), global_id_.child_id,
                             render_view_id_, global_id_.request_id);
 
   // Get the last modified time and etag.
   const net::HttpResponseHeaders* headers = request_->response_headers();
   if (headers) {
     std::string last_modified_hdr;
     std::string etag;
@@ skipping 273 matching lines @@
 
   // Remove output stream callback if a stream exists.
   if (stream_writer_.get())
     stream_writer_->RegisterCallback(base::Closure());
 
   UMA_HISTOGRAM_TIMES("SB2.DownloadDuration",
                       base::TimeTicks::Now() - download_start_time_);
 }
 
 }  // namespace content