Make SurfaceTextureHelper and I420Frame public in Java.

webrtc/api/android/java/src/org/webrtc/SurfaceTextureHelper.java

 /*
  *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 15 matching lines @@
 /**
  * Helper class to create and synchronize access to a SurfaceTexture. The caller will get notified
  * of new frames in onTextureFrameAvailable(), and should call returnTextureFrame() when done with
  * the frame. Only one texture frame can be in flight at once, so returnTextureFrame() must be
  * called in order to receive a new frame. Call stopListening() to stop receiveing new frames. Call
  * dispose to release all resources once the texture frame is returned.
  * Note that there is a C++ counter part of this class that optionally can be used. It is used for
  * wrapping texture frames into webrtc::VideoFrames and also handles calling returnTextureFrame()
  * when the webrtc::VideoFrame is no longer used.
  */
-class SurfaceTextureHelper {
+public class SurfaceTextureHelper {
   private static final String TAG = "SurfaceTextureHelper";
   /**
    * Callback interface for being notified that a new texture frame is available. The calls will be
    * made on a dedicated thread with a bound EGLContext. The thread will be the same throughout the
    * lifetime of the SurfaceTextureHelper instance, but different from the thread calling the
    * SurfaceTextureHelper constructor. The callee is not allowed to make another EGLContext current
    * on the calling thread.
    */
   public interface OnTextureFrameAvailableListener {
     abstract void onTextureFrameAvailable(
@@ skipping 227 matching lines @@
     }
     if (yuvConverter != null) {
       yuvConverter.release();
     }
     GLES20.glDeleteTextures(1, new int[] {oesTextureId}, 0);
     surfaceTexture.release();
     eglBase.release();
     handler.getLooper().quit();
   }
 }