Add a field trial to produce VideoFrames in camera capturers.

webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java

Index: webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java
diff --git a/webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java b/webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java
index 859b7f745331841016ff78ba52b34a27b1d4af09..3b442fb1637088771db3c366d3f27fa9559c5569 100644
--- a/webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java
+++ b/webrtc/sdk/android/src/java/org/webrtc/CameraCapturer.java
@@ -176,6 +176,23 @@ abstract class CameraCapturer implements CameraVideoCapturer {
       }
     }
 
+    @Override
+    public void onFrameCaptured(CameraSession session, VideoFrame frame) {
+      checkIsOnCameraThread();
+      synchronized (stateLock) {
+        if (session != currentSession) {
+          Logging.w(TAG, "onTextureFrameCaptured from another session.");
+          return;
+        }
+        if (!firstFrameObserved) {
+          eventsHandler.onFirstFrameAvailable();
+          firstFrameObserved = true;
+        }
+        cameraStatistics.addFrame();
+        capturerObserver.onFrameCaptured(frame);
+      }
+    }
+
     @Override
     public void onByteBufferFrameCaptured(
         CameraSession session, byte[] data, int width, int height, int rotation, long timestamp) {