Add V8 debugger agent....

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 1399)
+++ src/debug.cc	(working copy)
@@ -1355,6 +1355,7 @@
 void* Debugger::message_handler_data_ = NULL;
 v8::DebugHostDispatchHandler Debugger::host_dispatch_handler_ = NULL;
 void* Debugger::host_dispatch_handler_data_ = NULL;
+DebuggerAgent* Debugger::agent_ = NULL;
 
 
 Handle<Object> Debugger::MakeJSObject(Vector<const char> constructor_name,
@@ -1792,6 +1793,17 @@
 }
 
 
+bool Debugger::StartAgent(int port) {
+  if (Socket::Setup()) {
+    agent_ = new DebuggerAgent(port);
+    agent_->Start();
+    return true;
+  }
+
+  return false;
+}
+
+
 DebugMessageThread::DebugMessageThread()
     : host_running_(true),
       command_queue_(kQueueInitialSize),