First implementation of simulcast, adds VP8 simulcast to video engine.

Changed API to RTP module
Expanded Auto test with a test for simulcast
Made the video codec tests compile
Added the vp8_simulcast files to this cl
Added missing auto test file
Review URL: http://webrtc-codereview.appspot.com/188001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@736 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/utility/source/video_coder.h

@@ -64,7 +64,7 @@ private:
         const WebRtc_UWord8* payloadData,
         const WebRtc_UWord32 payloadSize,
         const RTPFragmentationHeader& /* fragmentationHeader*/,
-        const RTPVideoTypeHeader* rtpTypeHdr);
+        const RTPVideoHeader* rtpTypeHdr);
 
     WebRtc_UWord32 _instanceID;
     VideoCodingModule* _vcm;