Add DTLS support to NSS, contributed by Eric Rescorla.

net/third_party/nss/ssl/sslgathr.c

Index: net/third_party/nss/ssl/sslgathr.c
===================================================================
--- net/third_party/nss/ssl/sslgathr.c	(revision 127709)
+++ net/third_party/nss/ssl/sslgathr.c	(working copy)
@@ -434,6 +434,8 @@
     gs->state = GS_INIT;
     gs->writeOffset = 0;
     gs->readOffset  = 0;
+    gs->dtlsPacketOffset = 0;
+    gs->dtlsPacket.len = 0;
     status = sslBuffer_Grow(&gs->buf, 4096);
     return status;
 }
@@ -445,6 +447,7 @@
     if (gs) {	/* the PORT_*Free functions check for NULL pointers. */
 	PORT_ZFree(gs->buf.buf, gs->buf.space);
 	PORT_Free(gs->inbuf.buf);
+	PORT_Free(gs->dtlsPacket.buf);
     }
 }