This cl add support to encode from textures to MediaCodecVideoEncoder.

This has also partly been reviewed in https://codereview.webrtc.org/1375953002/.

BUG=webrtc:4993
TBR=glaznew@webrtc.org

Review URL: https://codereview.webrtc.org/1403713002

Cr-Commit-Position: refs/heads/master@{#10725}
diff --git a/talk/app/webrtc/java/jni/androidmediaencoder_jni.h b/talk/app/webrtc/java/jni/androidmediaencoder_jni.h
index ff124aa..8ff8164 100644
--- a/talk/app/webrtc/java/jni/androidmediaencoder_jni.h
+++ b/talk/app/webrtc/java/jni/androidmediaencoder_jni.h
@@ -43,6 +43,8 @@
   MediaCodecVideoEncoderFactory();
   virtual ~MediaCodecVideoEncoderFactory();
 
+  void SetEGLContext(JNIEnv* jni, jobject render_egl_context);
+
   // WebRtcVideoEncoderFactory implementation.
   webrtc::VideoEncoder* CreateVideoEncoder(webrtc::VideoCodecType type)
       override;
@@ -50,6 +52,7 @@
   void DestroyVideoEncoder(webrtc::VideoEncoder* encoder) override;
 
  private:
+  jobject egl_context_;
   // Empty if platform support is lacking, const after ctor returns.
   std::vector<VideoCodec> supported_codecs_;
 };