Make the rate limiting of Native Client Plugin progress events more robust.

ppapi/native_client/src/trusted/plugin/plugin.h

 // -*- c++ -*-
 // Copyright (c) 2011 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.
 
 // The portable representation of an instance and root scriptable object.
 // The PPAPI version of the plugin instantiates a subclass of this class.
 
 #ifndef NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
 #define NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_
@@ skipping 542 matching lines @@
       int64_t bytes_sent,
       int64_t total_bytes_to_be_sent,
       int64_t bytes_received,
       int64_t total_bytes_to_be_received);
 
   // Finds the file downloader which owns the given URL loader. This is used
   // in UpdateDownloadProgress to map a url loader back to the URL being
   // downloaded.
   const FileDownloader* FindFileDownloader(PP_Resource url_loader) const;
 
-  int64_t last_event_bytes_received_;
+  int64_t time_of_last_progress_event_;
 };
 
 }  // namespace plugin
 
 #endif  // NATIVE_CLIENT_SRC_TRUSTED_PLUGIN_PLUGIN_H_