Add fuzzer corpora.

webrtc/test/fuzzers/corpora/sdp-corpus/firefox-1.sdp

+v=0
+o=mozilla...THIS_IS_SDPARTA-46.0.1 5115930144083302970 0 IN IP4 0.0.0.0
+s=-
+t=0 0
+a=fingerprint:sha-256 24:67:5E:1B:9A:B9:CF:36:C5:30:8F:35:F7:B1:50:66:88:81:92:CB:29:BA:53:A5:02:C8:0A:A5:4E:9C:AE:D9
+a=group:BUNDLE sdparta_0 sdparta_1 sdparta_2
+a=ice-options:trickle
+a=msid-semantic:WMS *
+m=audio 9 UDP/TLS/RTP/SAVPF 109 9 0 8
+c=IN IP4 0.0.0.0
+a=sendrecv
+a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
+a=fmtp:109 maxplaybackrate=48000;stereo=1
+a=ice-pwd:b9f3911b591ae61e2d7f6af0531fd2a3
+a=ice-ufrag:3edc9012
+a=mid:sdparta_0
+a=msid:{258e92fb-547c-40ca-92e9-efe0cedb4cba} {bd1fafff-bfd0-40d4-b0a3-2a87cff307ee}
+a=rtcp-mux
+a=rtpmap:109 opus/48000/2
+a=rtpmap:9 G722/8000/1
+a=rtpmap:0 PCMU/8000
+a=rtpmap:8 PCMA/8000
+a=setup:actpass
+a=ssrc:2121669360 cname:{387b0735-bde2-43a4-8484-7f5663b60f24}
+m=video 9 UDP/TLS/RTP/SAVPF 120 126 97
+c=IN IP4 0.0.0.0
+a=sendrecv
+a=fmtp:126 profile-level-id=42e01f;level-asymmetry-allowed=1;packetization-mode=1
+a=fmtp:97 profile-level-id=42e01f;level-asymmetry-allowed=1
+a=fmtp:120 max-fs=12288;max-fr=60
+a=ice-pwd:b9f3911b591ae61e2d7f6af0531fd2a3
+a=ice-ufrag:3edc9012
+a=mid:sdparta_1
+a=msid:{258e92fb-547c-40ca-92e9-efe0cedb4cba} {9e8f5867-a9aa-4489-8bd4-3a8a57a5e592}
+a=rtcp-fb:120 nack
+a=rtcp-fb:120 nack pli
+a=rtcp-fb:120 ccm fir
+a=rtcp-fb:126 nack
+a=rtcp-fb:126 nack pli
+a=rtcp-fb:126 ccm fir
+a=rtcp-fb:97 nack
+a=rtcp-fb:97 nack pli
+a=rtcp-fb:97 ccm fir
+a=rtcp-mux
+a=rtpmap:120 VP8/90000
+a=rtpmap:126 H264/90000
+a=rtpmap:97 H264/90000
+a=setup:actpass
+a=ssrc:2158832026 cname:{387b0735-bde2-43a4-8484-7f5663b60f24}
+m=application 9 DTLS/SCTP 5000
+c=IN IP4 0.0.0.0
+a=sendrecv
+a=ice-pwd:b9f3911b591ae61e2d7f6af0531fd2a3
+a=ice-ufrag:3edc9012
+a=mid:sdparta_2
+a=sctpmap:5000 webrtc-datachannel 256
+a=setup:actpass
+a=ssrc:2670959794 cname:{387b0735-bde2-43a4-8484-7f5663b60f24}