Add support for RGB frames in MediaCodecVideoEncoder.

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

Index: webrtc/sdk/android/api/org/webrtc/RendererCommon.java
diff --git a/webrtc/sdk/android/api/org/webrtc/RendererCommon.java b/webrtc/sdk/android/api/org/webrtc/RendererCommon.java
index ac71d9fd2bd48050a5f0ad17a198d2c331b374b7..8f8d9fef4cf4058cbce82134886bca12729a33af 100644
--- a/webrtc/sdk/android/api/org/webrtc/RendererCommon.java
+++ b/webrtc/sdk/android/api/org/webrtc/RendererCommon.java
@@ -48,6 +48,12 @@ public class RendererCommon {
     void drawYuv(int[] yuvTextures, float[] texMatrix, int frameWidth, int frameHeight,
         int viewportX, int viewportY, int viewportWidth, int viewportHeight);
 
+    /**
+     * Draws a VideoFrame.TextureBuffer. Default implementation calls either drawOes or drawRgb
+     * depending on the type of the buffer. You can supply an additional render matrix. This is
+     * used multiplied together with the transformation matrix of the frame. (M = renderMatrix *
+     * transformationMatrix)
+     */
     default void
       drawTexture(VideoFrame.TextureBuffer buffer, android.graphics.Matrix renderMatrix,
           int frameWidth, int frameHeight, int viewportX, int viewportY, int viewportWidth,