Add support for RGB frames in MediaCodecVideoEncoder.

webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java

Index: webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java
diff --git a/webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java b/webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java
index 808b43d6dfdd261d4734350b03d5f82a7964a204..dee0c94a39db254d324146b61461d706e13aa1ad 100644
--- a/webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java
+++ b/webrtc/sdk/android/api/org/webrtc/MediaCodecVideoEncoder.java
@@ -616,10 +616,8 @@ public class MediaCodecVideoEncoder {
         // TODO(perkj): glClear() shouldn't be necessary since every pixel is covered anyway,
         // but it's a workaround for bug webrtc:5147.
         GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
-        drawer.drawOes(textureBuffer.getTextureId(),
-            RendererCommon.convertMatrixFromAndroidGraphicsMatrix(
-                textureBuffer.getTransformMatrix()),
-            width, height, 0, 0, width, height);
+        drawer.drawTexture(textureBuffer, new Matrix(), width, height, 0 /* viewportX */,

[magjed_webrtc, 2017/08/25 13:15:43]

Comment /* renderMatrix */. Also, we should probably comment in the interface
how this works because it was confusing to me.

[sakal, 2017/08/28 08:06:29]

Done.

+            0 /* viewportY */, width, height);
         eglBase.swapBuffers(frame.getTimestampNs());
       } else {
         VideoFrame.I420Buffer i420Buffer = buffer.toI420();