Enable round-tripping and updating of SourceBuffer timestamp offset

Source/modules/mediasource/WebKitSourceBuffer.cpp

Index: Source/modules/mediasource/WebKitSourceBuffer.cpp
diff --git a/Source/modules/mediasource/WebKitSourceBuffer.cpp b/Source/modules/mediasource/WebKitSourceBuffer.cpp
index fa82ac6c118ab30a7fc3426231b03a012401edcc..f290939b66704b8d17349b92a71af3267ca516f4 100644
--- a/Source/modules/mediasource/WebKitSourceBuffer.cpp
+++ b/Source/modules/mediasource/WebKitSourceBuffer.cpp
@@ -139,6 +139,12 @@ void WebKitSourceBuffer::append(PassRefPtr<Uint8Array> data, ExceptionState& exc
 
     // Steps 6 & beyond are handled by m_webSourceBuffer.
     m_webSourceBuffer->append(data->data(), data->length());
+
+    // Retrieve the implementation's possibly updated timestamp offset resulting
+    // from the append. In reality, since this prefixed API does not support
+    // "sequence" append mode, the offset should not have changed due to
+    // append processing.
+    m_timestampOffset = m_webSourceBuffer->getTimestampOffset();

[acolwell GONE FROM CHROMIUM, 2014/02/25 17:50:57]

Remove this. As your comment states, the timestampOffset should not be updated
for the prefixed API since it is never in 'sequence' mode.

[wolenetz, 2014/02/25 20:33:32]

Done.

 }
 
 void WebKitSourceBuffer::abort(ExceptionState& exceptionState)