Move rendering code in SurfaceViewRenderer to a separate class.

The new SurfaceEglRenderer helper class extends EglRenderer and
implements rendering on a SurfaceView.

Bug: webrtc:8242
Change-Id: Ic532fe487755d3b54c6bd03f239d714e1ecb10ad
Reviewed-on: https://webrtc-review.googlesource.com/2940
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20562}

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

@@ -76,7 +76,7 @@ public class EglRenderer implements VideoRenderer.Callbacks, VideoSink {
     }
   }
 
-  private final String name;
+  protected final String name;
 
   // |renderThreadHandler| is a handler for communicating with |renderThread|, and is synchronized
   // on |handlerLock|.