Use a saved copy of the time when pausing media elements.

webkit/glue/webmediaplayer_impl.h

 // Copyright (c) 2008-2009 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.
 //
 // Delegate calls from WebCore::MediaPlayerPrivate to Chrome's video player.
 // It contains PipelineImpl which is the actual media player pipeline, it glues
 // the media player pipeline, data source, audio renderer and renderer.
 // PipelineImpl would creates multiple threads and access some public methods
 // of this class, so we need to be extra careful about concurrent access of
 // methods and members.
@@ skipping 253 matching lines @@
   // The actual pipeline and the thread it runs on.
   scoped_refptr<media::PipelineImpl> pipeline_;
   base::Thread pipeline_thread_;
 
   // Playback state.
   //
   // TODO(scherkus): we have these because Pipeline favours the simplicity of a
   // single "playback rate" over worrying about paused/stopped etc...  It forces
   // all clients to manage the pause+playback rate externally, but is that
   // really a bad thing?
+  //
+  // TODO(scherkus): since SetPlaybackRate(0) is asynchronous and we don't want
+  // to hang the render thread during pause(), we record the time at the same
+  // time we pause and then return that value in currentTime().  Otherwise our
+  // clock can creep forward a little bit while the asynchronous
+  // SetPlaybackRate(0) is being executed.
   bool paused_;
   float playback_rate_;
+  base::TimeDelta paused_time_;
 
   WebKit::WebMediaPlayerClient* client_;
 
   scoped_refptr<Proxy> proxy_;
 
 #if WEBKIT_USING_CG
   scoped_ptr<skia::PlatformCanvas> skia_canvas_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace webkit_glue
 
 #endif  // WEBKIT_GLUE_WEBMEDIAPLAYER_IMPL_H_