FrameGenerator class for future fake capture device.

BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1511004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4093 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/video_engine/test/common/video_renderer.h b/video_engine/test/common/video_renderer.h
index 6865d5a..b312fbe 100644
--- a/video_engine/test/common/video_renderer.h
+++ b/video_engine/test/common/video_renderer.h
@@ -21,6 +21,8 @@
                                size_t width,
                                size_t height);
   virtual ~VideoRenderer() {}
+ protected:
+  VideoRenderer() {}
 };
 }  // test
 }  // webrtc