Implement debugger connection on Windows.

runtime/bin/dbg_connection_macos.cc

Index: runtime/bin/dbg_connection_macos.cc
diff --git a/runtime/bin/dbg_connection_macos.cc b/runtime/bin/dbg_connection_macos.cc
index 8464abf3a3bc263147be9213c9a58c0e0073645b..675e12966610b2eb6252f23556db646b7798602f 100644
--- a/runtime/bin/dbg_connection_macos.cc
+++ b/runtime/bin/dbg_connection_macos.cc
@@ -157,3 +157,15 @@ void DebuggerConnectionImpl::StartHandler(int port_number) {
     FATAL1("Failed to start debugger connection handler thread: %d\n", result);
   }
 }
+
+
+intptr_t DebuggerConnectionImpl::Send(intptr_t socket,
+                                      const char* buf,
+                                      int len) {
+  return TEMP_FAILURE_RETRY(write(socket, buf, len));
+}
+
+
+intptr_t DebuggerConnectionImpl::Receive(intptr_t socket, char* buf, int len) {
+  return TEMP_FAILURE_RETRY(read(socket, buf, len));
+}