Support setting an explicit duration on MediaSource objects

webkit/media/webmediaplayer_impl.cc

Index: webkit/media/webmediaplayer_impl.cc
diff --git a/webkit/media/webmediaplayer_impl.cc b/webkit/media/webmediaplayer_impl.cc
index e07b0d4c3cdcf42d2a88e7603b9c4a5e16aa521f..0b9cc7a770757fbf667efab82d1cdfb8467ea77f 100644
--- a/webkit/media/webmediaplayer_impl.cc
+++ b/webkit/media/webmediaplayer_impl.cc
@@ -665,6 +665,16 @@ bool WebMediaPlayerImpl::sourceAbort(const WebKit::WebString& id) {
   return true;
 }
 
+void WebMediaPlayerImpl::sourceSetDuration(double new_duration) {
+  if (static_cast<double>(duration()) == new_duration)
+    return;
+
+  proxy_->DemuxerSetDuration(
+      base::TimeDelta::FromMicroseconds(
+          new_duration * base::Time::kMicrosecondsPerSecond));
+  GetClient()->durationChanged();
+}
+
 void WebMediaPlayerImpl::sourceEndOfStream(
     WebMediaPlayer::EndOfStreamStatus status) {
   DCHECK_EQ(main_loop_, MessageLoop::current());