Add test to verify that padding only frames are passing through the RTP module.

Review URL: https://webrtc-codereview.appspot.com/934023

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3224 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc

@@ -24,7 +24,7 @@ class RtpRtcpAPITest : public ::testing::Test {
  protected:
   RtpRtcpAPITest() {
     test_CSRC[0] = 1234;
-    test_CSRC[2] = 2345;
+    test_CSRC[1] = 2345;
     test_id = 123;
     test_ssrc = 3456;
     test_timestamp = 4567;