Make ExtractorSampleSource amenable to proguarding.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=122085277

demo/src/main/java/com/google/android/exoplayer/demo/PlayerActivity.java

@@ -283,8 +283,8 @@ public class PlayerActivity extends Activity implements SurfaceHolder.Callback,
       case Util.TYPE_OTHER:
         Allocator allocator = new DefaultAllocator(C.DEFAULT_BUFFER_SEGMENT_SIZE);
         DataSource dataSource = dataSourceFactory.createDataSource(player.getBandwidthMeter());
-        return new ExtractorSampleSource(uri, dataSource, allocator,
-            C.DEFAULT_MUXED_BUFFER_SIZE, player.getMainHandler(), player, 0);
+        return new ExtractorSampleSource(uri, dataSource, allocator, C.DEFAULT_MUXED_BUFFER_SIZE,
+            player.getMainHandler(), player, 0, ExtractorSampleSource.newDefaultExtractors());
       default:
         throw new IllegalStateException("Unsupported type: " + type);
     }

extensions/flac/src/androidTest/java/com/google/android/exoplayer/ext/flac/FlacPlaybackTest.java

@@ -19,6 +19,7 @@ import com.google.android.exoplayer.DefaultTrackSelector;
 import com.google.android.exoplayer.ExoPlaybackException;
 import com.google.android.exoplayer.ExoPlayer;
 import com.google.android.exoplayer.TrackRenderer;
+import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.ExtractorSampleSource;
 import com.google.android.exoplayer.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer.upstream.DefaultAllocator;
@@ -83,7 +84,7 @@ public class FlacPlaybackTest extends InstrumentationTestCase {
           new DefaultDataSource(context, null, Util.getUserAgent(context, "ExoPlayerExtFlacTest"),
               false),
           new DefaultAllocator(BUFFER_SEGMENT_SIZE), BUFFER_SEGMENT_SIZE * BUFFER_SEGMENT_COUNT,
-          new MatroskaExtractor());
+          new Extractor[] {new MatroskaExtractor()});
       player.setSource(sampleSource);
       player.setPlayWhenReady(true);
       Looper.loop();

extensions/opus/src/androidTest/java/com/google/android/exoplayer/ext/opus/OpusPlaybackTest.java

@@ -19,6 +19,7 @@ import com.google.android.exoplayer.DefaultTrackSelector;
 import com.google.android.exoplayer.ExoPlaybackException;
 import com.google.android.exoplayer.ExoPlayer;
 import com.google.android.exoplayer.TrackRenderer;
+import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.ExtractorSampleSource;
 import com.google.android.exoplayer.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer.upstream.DefaultAllocator;
@@ -83,7 +84,7 @@ public class OpusPlaybackTest extends InstrumentationTestCase {
           new DefaultDataSource(context, null, Util.getUserAgent(context, "ExoPlayerExtOpusTest"),
               false),
           new DefaultAllocator(BUFFER_SEGMENT_SIZE), BUFFER_SEGMENT_SIZE * BUFFER_SEGMENT_COUNT,
-          new MatroskaExtractor());
+          new Extractor[] {new MatroskaExtractor()});
       player.setSource(sampleSource);
       player.setPlayWhenReady(true);
       Looper.loop();

extensions/vp9/src/androidTest/java/com/google/android/exoplayer/ext/vp9/VpxPlaybackTest.java

@@ -19,6 +19,7 @@ import com.google.android.exoplayer.DefaultTrackSelector;
 import com.google.android.exoplayer.ExoPlaybackException;
 import com.google.android.exoplayer.ExoPlayer;
 import com.google.android.exoplayer.TrackRenderer;
+import com.google.android.exoplayer.extractor.Extractor;
 import com.google.android.exoplayer.extractor.ExtractorSampleSource;
 import com.google.android.exoplayer.extractor.mkv.MatroskaExtractor;
 import com.google.android.exoplayer.upstream.DefaultAllocator;
@@ -99,7 +100,7 @@ public class VpxPlaybackTest extends InstrumentationTestCase {
           new DefaultDataSource(context, null, Util.getUserAgent(context, "ExoPlayerExtVP9Test"),
               false),
           new DefaultAllocator(BUFFER_SEGMENT_SIZE), BUFFER_SEGMENT_SIZE * BUFFER_SEGMENT_COUNT,
-          new MatroskaExtractor());
+          new Extractor[] {new MatroskaExtractor()});
       player.sendMessage(videoRenderer, LibvpxVideoTrackRenderer.MSG_SET_OUTPUT_BUFFER_RENDERER,
           new VpxVideoSurfaceView(context));
       player.setSource(sampleSource);