Implement debugger connection on Windows.

runtime/bin/dbg_connection_linux.cc

Index: runtime/bin/dbg_connection_linux.cc
diff --git a/runtime/bin/dbg_connection_linux.cc b/runtime/bin/dbg_connection_linux.cc
index a0bce37c0fafea4ae55fa4d4533373e57d477852..ce255598f786a5783124b54d4f7d041393b5cba4 100644
--- a/runtime/bin/dbg_connection_linux.cc
+++ b/runtime/bin/dbg_connection_linux.cc
@@ -103,3 +103,15 @@ 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));
+}