Add a field trial to produce VideoFrames in camera capturers.

webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java

Index: webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
diff --git a/webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java b/webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
index 02dac1582add36db7ab255e3b8de221685f248ea..28e7c7a8d082e689608c6ed8a149150c2fc49cab 100644
--- a/webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
+++ b/webrtc/examples/androidapp/src/org/appspot/apprtc/PeerConnectionClient.java
@@ -26,8 +26,8 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Timer;
 import java.util.TimerTask;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import org.appspot.apprtc.AppRTCClient.SignalingParameters;
@@ -56,9 +56,9 @@ import org.webrtc.VideoSource;
 import org.webrtc.VideoTrack;
 import org.webrtc.voiceengine.WebRtcAudioManager;
 import org.webrtc.voiceengine.WebRtcAudioRecord;
-import org.webrtc.voiceengine.WebRtcAudioTrack;
 import org.webrtc.voiceengine.WebRtcAudioRecord.AudioRecordStartErrorCode;
 import org.webrtc.voiceengine.WebRtcAudioRecord.WebRtcAudioRecordErrorCallback;
+import org.webrtc.voiceengine.WebRtcAudioTrack;
 import org.webrtc.voiceengine.WebRtcAudioTrack.WebRtcAudioTrackErrorCallback;
 import org.webrtc.voiceengine.WebRtcAudioUtils;
 
@@ -89,6 +89,9 @@ public class PeerConnectionClient {
       "WebRTC-H264HighProfile/Enabled/";
   private static final String DISABLE_WEBRTC_AGC_FIELDTRIAL =
       "WebRTC-Audio-MinimizeResamplingOnMobile/Enabled/";
+  private static final String VIDEO_FRAME_EMIT_FIELDTRIAL =
+      PeerConnectionFactory.VIDEO_FRAME_EMIT_TRIAL + "/" + PeerConnectionFactory.TRIAL_ENABLED
+      + "/";
   private static final String AUDIO_CODEC_PARAM_BITRATE = "maxaveragebitrate";
   private static final String AUDIO_ECHO_CANCELLATION_CONSTRAINT = "googEchoCancellation";
   private static final String AUDIO_AUTO_GAIN_CONTROL_CONSTRAINT = "googAutoGainControl";
@@ -398,6 +401,7 @@ public class PeerConnectionClient {
       fieldTrials += DISABLE_WEBRTC_AGC_FIELDTRIAL;
       Log.d(TAG, "Disable WebRTC AGC field trial.");
     }
+    fieldTrials += VIDEO_FRAME_EMIT_FIELDTRIAL;
 
     // Check preferred video codec.
     preferredVideoCodec = VIDEO_CODEC_VP8;