Enabled EMSG and CEA-608 embedded streams for DASH

Issue: #2362
Issue: #2176

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=149524412

library/src/main/java/com/google/android/exoplayer2/source/chunk/BaseMediaChunkOutput.java

@@ -35,7 +35,7 @@ import com.google.android.exoplayer2.source.chunk.ChunkExtractorWrapper.TrackOut
    * @param trackTypes The track types of the individual track outputs.
    * @param trackOutputs The individual track outputs.
    */
-  public BaseMediaChunkOutput(int[] trackTypes, DefaultTrackOutput... trackOutputs) {
+  public BaseMediaChunkOutput(int[] trackTypes, DefaultTrackOutput[] trackOutputs) {
     this.trackTypes = trackTypes;
     this.trackOutputs = trackOutputs;
   }

library/src/main/java/com/google/android/exoplayer2/source/smoothstreaming/SsMediaPeriod.java

@@ -185,8 +185,8 @@ import java.util.ArrayList;
     int streamElementIndex = trackGroups.indexOf(selection.getTrackGroup());
     SsChunkSource chunkSource = chunkSourceFactory.createChunkSource(manifestLoaderErrorThrower,
         manifest, streamElementIndex, selection, trackEncryptionBoxes);
-    return new ChunkSampleStream<>(manifest.streamElements[streamElementIndex].type, chunkSource,
-        this, allocator, positionUs, minLoadableRetryCount, eventDispatcher);
+    return new ChunkSampleStream<>(manifest.streamElements[streamElementIndex].type, null,
+        chunkSource, this, allocator, positionUs, minLoadableRetryCount, eventDispatcher);
   }
 
   private static TrackGroupArray buildTrackGroups(SsManifest manifest) {