Unit test for WebMediaPlayerMS

content/renderer/media/webmediaplayer_ms_compositor.cc

Index: content/renderer/media/webmediaplayer_ms_compositor.cc
diff --git a/content/renderer/media/webmediaplayer_ms_compositor.cc b/content/renderer/media/webmediaplayer_ms_compositor.cc
index 198878f0cb682a4f96e49874288ac1f282fab7d5..095f54897faea41db2be02ed3b4ff7dab498fdf9 100644
--- a/content/renderer/media/webmediaplayer_ms_compositor.cc
+++ b/content/renderer/media/webmediaplayer_ms_compositor.cc
@@ -108,7 +108,8 @@ WebMediaPlayerMSCompositor::WebMediaPlayerMSCompositor(
   const blink::WebMediaStream web_stream(
       blink::WebMediaStreamRegistry::lookupMediaStreamDescriptor(url));
   blink::WebVector<blink::WebMediaStreamTrack> video_tracks;
-  web_stream.videoTracks(video_tracks);
+  if (!web_stream.isNull())
+    web_stream.videoTracks(video_tracks);
 
   const bool remote_video =
       video_tracks.size() && video_tracks[0].source().remote();
@@ -371,4 +372,19 @@ void WebMediaPlayerMSCompositor::SetCurrentFrame(
   main_message_loop_->PostTask(
       FROM_HERE, base::Bind(&WebMediaPlayerMS::ResetCanvasCache, player_));
 }
+
+void WebMediaPlayerMSCompositor::SetAlgorithmEnabledForTesting(
+    bool algorithm_enabled) {
+  if (!algorithm_enabled) {
+    rendering_frame_buffer_.reset();
+    return;
+  }
+
+  if (!rendering_frame_buffer_) {
+    rendering_frame_buffer_.reset(new media::VideoRendererAlgorithm(
+        base::Bind(&WebMediaPlayerMSCompositor::MapTimestampsToRenderTimeTicks,
+                   base::Unretained(this))));
+  }
 }
+
+}  // namespace content