Implement AndroidTextureBuffer::NativeToI420.

talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc

Index: talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc
diff --git a/talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc b/talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc
index 8fd42a0a58228d0e703918b8809fe6d57cf2285b..8b5742fc01c4f49b1d73ec12ab3749e4583fda28 100644
--- a/talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc
+++ b/talk/app/webrtc/java/jni/surfacetexturehelper_jni.cc
@@ -72,7 +72,7 @@ rtc::scoped_refptr<webrtc::VideoFrameBuffer>
 SurfaceTextureHelper::CreateTextureFrame(int width, int height,
     const NativeHandleImpl& native_handle) {
   return new rtc::RefCountedObject<AndroidTextureBuffer>(
-      width, height, native_handle,
+      width, height, native_handle, *j_surface_texture_helper_,
       rtc::Bind(&SurfaceTextureHelper::ReturnTextureFrame, this));
 }