API: Added Debug::DisableAgent to match existing Debug::EnableAgent

BUG=v8:1573
TEST=cctest test-debug/TestDebuggerAgent

Review URL: http://codereview.chromium.org/7978025

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9361 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

include/v8-debug.h

@@ -339,6 +339,11 @@ class EXPORT Debug {
   static bool EnableAgent(const char* name, int port,
                           bool wait_for_connection = false);
 
+  /**
+    * Disable the V8 builtin debug agent. The TCP/IP connection will be closed.
+    */
+  static void DisableAgent();
+
   /**
    * Makes V8 process all pending debug messages.
    *

src/api.cc

@@ -5470,6 +5470,12 @@ bool Debug::EnableAgent(const char* name, int port, bool wait_for_connection) {
                                                        wait_for_connection);
 }
 
+
+void Debug::DisableAgent() {
+  return i::Isolate::Current()->debugger()->StopAgent();
+}
+
+
 void Debug::ProcessDebugMessages() {
   i::Execution::ProcessDebugMesssages(true);
 }