Add support for adding VideoSinks to VideoTracks.

webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc

Index: webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc
diff --git a/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc b/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc
index c9b691e11463a5083a97b1961d73e991b63f46c8..c5bbe5a34f00a87dd8109fc606f9ad64e99f339a 100644
--- a/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc
+++ b/webrtc/sdk/android/src/jni/wrapped_native_i420_buffer.cc
@@ -17,10 +17,8 @@ namespace webrtc_jni {
 
 // TODO(magjed): Write a test for this function.
 jobject WrapI420Buffer(
+    JNIEnv* jni,
     const rtc::scoped_refptr<webrtc::I420BufferInterface>& i420_buffer) {
-  JNIEnv* jni = AttachCurrentThreadIfNeeded();
-  ScopedLocalRefFrame local_ref_frame(jni);
-
   jclass j_wrapped_native_i420_buffer_class =
       FindClass(jni, "org/webrtc/WrappedNativeI420Buffer");
   jmethodID j_wrapped_native_i420_buffer_ctor_id =