Support more debugger commands in the wire protocol

runtime/bin/dbg_connection.h

Index: runtime/bin/dbg_connection.h
===================================================================
--- runtime/bin/dbg_connection.h	(revision 7517)
+++ runtime/bin/dbg_connection.h	(working copy)
@@ -43,10 +43,19 @@
   static void CloseDbgConnection();
 
   static void HandleMessages();
-  static void HandleResumeCmd();
+  static void HandleResumeCmd(const char* msg);
+  static void HandleStepIntoCmd(const char* msg);
+  static void HandleStepOverCmd(const char* msg);
+  static void HandleStepOutCmd(const char* msg);
+  static void HandleGetLibraryURLsCmd(const char* json_msg);
+  static void HandleGetScriptURLsCmd(const char* json_msg);
 
+  static void SendError(int msg_id, const char* format, ...);
+
   static bool handler_started_;
 
+  static bool request_resume_;
+
   // The socket that is listening for incoming debugger connections.
   // This descriptor is created and closed by a VM thread.
   static int listener_fd_;