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

content/browser/download/download_stats.h

 // 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.
 //
 // Holds helpers for gathering UMA stats about downloads.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 #define CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_
 
 #include <string>
@@ skipping 92 matching lines @@
 void RecordDownloadCompleted(const base::TimeTicks& start, int64 download_len);
 
 // Record INTERRUPTED_COUNT, |reason|, |received| and |total| bytes.
 void RecordDownloadInterrupted(DownloadInterruptReason reason,
                                int64 received,
                                int64 total);
 
 // Records the mime type of the download.
 void RecordDownloadMimeType(const std::string& mime_type);
 
+// Records usage of Content-Disposition header.
+void RecordDownloadContentDisposition(const std::string& content_disposition);
+
 // Record WRITE_SIZE_COUNT and data_len.
 void RecordDownloadWriteSize(size_t data_len);
 
 // Record WRITE_LOOP_COUNT and number of loops.
 void RecordDownloadWriteLoopCount(int count);
 
 // Record the number of buffers piled up by the IO thread
 // before the file thread gets to draining them.
 void RecordFileThreadReceiveBuffers(size_t num_buffers);
 
@@ skipping 45 matching lines @@
   SAVE_PACKAGE_WRITE_TO_FAILED,
 
   SAVE_PACKAGE_LAST_ENTRY
 };
 
 void RecordSavePackageEvent(SavePackageEvent event);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_DOWNLOAD_STATS_H_