Add setNoDelay method on Socket/RawSocket.

runtime/bin/socket_linux.cc

Index: runtime/bin/socket_linux.cc
diff --git a/runtime/bin/socket_linux.cc b/runtime/bin/socket_linux.cc
index cdaab9222e674fce3f1ced7c18e37d3235b69373..33e632de0a9e9912d358fbd7143779783560c709 100644
--- a/runtime/bin/socket_linux.cc
+++ b/runtime/bin/socket_linux.cc
@@ -11,6 +11,7 @@
 #include <string.h>  // NOLINT
 #include <sys/stat.h>  // NOLINT
 #include <unistd.h>  // NOLINT
+#include <netinet/tcp.h>  // NOLINT
 
 #include "bin/fdutils.h"
 #include "bin/file.h"
@@ -286,4 +287,14 @@ bool Socket::SetBlocking(intptr_t fd) {
   return FDUtils::SetBlocking(fd);
 }
 
+
+bool Socket::SetNoDelay(intptr_t fd, bool enabled) {
+  int on = enabled ? 1 : 0;
+  return TEMP_FAILURE_RETRY(setsockopt(fd,
+                                       SOL_TCP,
+                                       TCP_NODELAY,
+                                       reinterpret_cast<char *>(&on),
+                                       sizeof(on))) == 0;
+}
+
 #endif  // defined(TARGET_OS_LINUX)