Implement "wait for connection" feature

include/v8-debug.h

Index: include/v8-debug.h
diff --git a/include/v8-debug.h b/include/v8-debug.h
index b27bacc1080123b11f6a93c3302147aac3013b0d..2220b0402195ee8af2c4574b85b2f68d99fc8780 100644
--- a/include/v8-debug.h
+++ b/include/v8-debug.h
@@ -258,8 +258,11 @@ class EXPORT Debug {
   * supplied TCP/IP port for remote debugger connection.
   * \param name the name of the embedding application
   * \param port the TCP/IP port to listen on
+  * \param wait_for_connection whether V8 should pause on a first breakpoint
+  *   allowing remote debugger to connect before anything interesting happened
   */
-  static bool EnableAgent(const char* name, int port);
+  static bool EnableAgent(const char* name, int port,
+                          bool wait_for_connection = false);
 };