Add a field trial to produce VideoFrames in camera capturers.

webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java

Index: webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java
diff --git a/webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java b/webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java
index d1950690c34f7f1b10a413e6ab1ca17a42621088..b672dd1e0b8c58e9880328daf9171fa4113f84f5 100644
--- a/webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java
+++ b/webrtc/sdk/android/src/java/org/webrtc/Camera1Session.java
@@ -267,8 +267,12 @@ class Camera1Session implements CameraSession {
           transformMatrix = RendererCommon.multiplyMatrices(
               transformMatrix, RendererCommon.horizontalFlipMatrix());
         }
-        events.onTextureFrameCaptured(Camera1Session.this, captureFormat.width,
-            captureFormat.height, oesTextureId, transformMatrix, rotation, timestampNs);
+        final VideoFrame.Buffer buffer = surfaceTextureHelper.createTextureBuffer(
+            captureFormat.width, captureFormat.height, transformMatrix);
+        final VideoFrame frame = new VideoFrame(buffer, rotation, timestampNs,
+            RendererCommon.convertMatrixToAndroidGraphicsMatrix(transformMatrix));
+        events.onFrameCaptured(Camera1Session.this, frame);
+        frame.release();
       }
     });
   }
@@ -276,7 +280,7 @@ class Camera1Session implements CameraSession {
   private void listenForBytebufferFrames() {
     camera.setPreviewCallbackWithBuffer(new android.hardware.Camera.PreviewCallback() {
       @Override
-      public void onPreviewFrame(byte[] data, android.hardware.Camera callbackCamera) {
+      public void onPreviewFrame(final byte[] data, android.hardware.Camera callbackCamera) {
         checkIsOnCameraThread();
 
         if (callbackCamera != camera) {
@@ -298,9 +302,14 @@ class Camera1Session implements CameraSession {
           firstFrameReported = true;
         }
 
-        events.onByteBufferFrameCaptured(Camera1Session.this, data, captureFormat.width,
-            captureFormat.height, getFrameOrientation(), captureTimeNs);
+        final I420BufferImpl frameBuffer =
+            I420BufferImpl.allocate(captureFormat.width, captureFormat.height);
+        nativeNV21ToI420(captureFormat.width, captureFormat.height, data, frameBuffer.getBuffer());
         camera.addCallbackBuffer(data);
+        final VideoFrame frame = new VideoFrame(frameBuffer, getFrameOrientation(), captureTimeNs,
+            RendererCommon.convertMatrixToAndroidGraphicsMatrix(RendererCommon.identityMatrix()));
+        events.onFrameCaptured(Camera1Session.this, frame);
+        frame.release();
       }
     });
   }
@@ -340,4 +349,6 @@ class Camera1Session implements CameraSession {
       throw new IllegalStateException("Wrong thread");
     }
   }
+
+  private static native void nativeNV21ToI420(int width, int height, byte[] src, ByteBuffer dst);
 }