Implement issue 554 Add "ProcessDebuggerRequests" call to Debug Agent API

src/api.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 3726 matching lines @@
                                               kArgc,
                                               argv);
   EXCEPTION_BAILOUT_CHECK(Local<Value>());
   return scope.Close(result);
 }
 
 
 bool Debug::EnableAgent(const char* name, int port, bool wait_for_connection) {
   return i::Debugger::StartAgent(name, port, wait_for_connection);
 }
+
+void Debug::ProcessDebugMessages() {
+  i::Execution::ProcessDebugMesssages(true);
+}
+
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 namespace internal {
 
 
 HandleScopeImplementer* HandleScopeImplementer::instance() {
   return &thread_local;
 }
 
 
@@ skipping 65 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal