Introduce DecodeTimestamp class to make it easier to distiguish presentation and decode timestamps.

media/formats/webm/webm_cluster_parser.h

Index: media/formats/webm/webm_cluster_parser.h
diff --git a/media/formats/webm/webm_cluster_parser.h b/media/formats/webm/webm_cluster_parser.h
index ab1d4a11fb11505ba34f664b840bb998c17521ab..caf42f4b9c3d96109e0ebefbc5268a10baf8cf40 100644
--- a/media/formats/webm/webm_cluster_parser.h
+++ b/media/formats/webm/webm_cluster_parser.h
@@ -49,12 +49,12 @@ class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
 
     // If a buffer is currently held aside pending duration calculation, returns
     // its decode timestamp. Otherwise, returns kInfiniteDuration().
-    base::TimeDelta GetReadyUpperBound();
+    DecodeTimestamp GetReadyUpperBound();
 
     // Prepares |ready_buffers_| for retrieval. Prior to calling,
     // |ready_buffers_| must be empty. Moves all |buffers_| with timestamp

[wolenetz, 2014/08/08 21:30:05]

nit: s/timestamp/decode timestamp/

[acolwell GONE FROM CHROMIUM, 2014/08/11 17:05:06]

Done.

     // before |before_timestamp| to |ready_buffers_|, preserving their order.
-    void ExtractReadyBuffers(const base::TimeDelta before_timestamp);
+    void ExtractReadyBuffers(const DecodeTimestamp before_timestamp);
 
     const BufferQueue& ready_buffers() const { return ready_buffers_; }
 
@@ -263,7 +263,7 @@ class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
   // Get{Audio,Video,Text}Buffers() will calculate it to be the minimum (decode)
   // timestamp across all tracks' |last_buffer_missing_duration_|, or
   // kInfiniteDuration() if no buffers are currently missing duration.
-  base::TimeDelta ready_buffer_upper_bound_;
+  DecodeTimestamp ready_buffer_upper_bound_;
 
   LogCB log_cb_;