Add VP9 codec to VCM and vie_auto_test.

Include VP9 tests in videoprocessor_integrationtests.
Include end-to-end send/receiveVP9 test.

This is the same patch as https://code.google.com/p/webrtc/source/detail?r=7422, which was reverted when rolled into chrome (due to bss size increase). Relanding this again as we now have the clear to get this in:
see https://code.google.com/p/webrtc/issues/detail?id=3932

R=kjellander@webrtc.org, mflodman@webrtc.org, stefan@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31829004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7588 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/test/test_util.cc

@@ -151,6 +151,7 @@ webrtc::RtpVideoCodecTypes ConvertCodecType(const char* plname) {
   if (strncmp(plname,"VP8" , 3) == 0) {
     return webrtc::kRtpVideoVp8;
   } else {
-    return webrtc::kRtpVideoNone;  // Default value
+    // Default value.
+    return webrtc::kRtpVideoGeneric;
   }
 }