Android VideoCapture : Use NV21 instead of YUV12 and clean up.

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

Index: talk/app/webrtc/java/jni/androidmediadecoder_jni.cc
diff --git a/talk/app/webrtc/java/jni/androidmediadecoder_jni.cc b/talk/app/webrtc/java/jni/androidmediadecoder_jni.cc
index fbe5b5ca785985ff069d5ed4c471ba021a480291..49b84aa58522268d65c176373595e0f4bda1dbaf 100644
--- a/talk/app/webrtc/java/jni/androidmediadecoder_jni.cc
+++ b/talk/app/webrtc/java/jni/androidmediadecoder_jni.cc
@@ -318,9 +318,19 @@ int32_t MediaCodecVideoDecoder::InitDecodeOnCodecThread() {
   frames_received_ = 0;
   frames_decoded_ = 0;
 
+  jobject java_surface_texture_helper_ = nullptr;
   if (use_surface_) {
+    java_surface_texture_helper_ = jni->CallStaticObjectMethod(
+        FindClass(jni, "org/webrtc/SurfaceTextureHelper"),
+        GetStaticMethodID(jni,
+                          FindClass(jni, "org/webrtc/SurfaceTextureHelper"),
+                          "create",
+                          "(Lorg/webrtc/EglBase$Context;)"
+                          "Lorg/webrtc/SurfaceTextureHelper;"),
+        render_egl_context_);
+    RTC_CHECK(java_surface_texture_helper_ != nullptr);
     surface_texture_helper_ = new rtc::RefCountedObject<SurfaceTextureHelper>(
-        jni, render_egl_context_);
+        jni, java_surface_texture_helper_);
   }
 
   jobject j_video_codec_enum = JavaEnumFromIndex(
@@ -331,8 +341,7 @@ int32_t MediaCodecVideoDecoder::InitDecodeOnCodecThread() {
       j_video_codec_enum,
       codec_.width,
       codec_.height,
-      use_surface_ ? surface_texture_helper_->GetJavaSurfaceTextureHelper()
-                   : nullptr);
+      java_surface_texture_helper_);
   if (CheckException(jni) || !success) {
     ALOGE << "Codec initialization error - fallback to SW codec.";
     sw_fallback_required_ = true;