Introduce API to temporarily interrupt long running JavaScript code.

src/api.cc

 // Copyright 2012 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 6704 matching lines @@
   return IsExecutionTerminatingCheck(i_isolate);
 }
 
 
 void V8::CancelTerminateExecution(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   i_isolate->stack_guard()->CancelTerminateExecution();
 }
 
 
+void Isolate::RequestInterrupt(InterruptCallback callback, void* data) {
+  reinterpret_cast<i::Isolate*>(this)->stack_guard()->RequestInterrupt(
+      callback, data);
+}
+
+
+void Isolate::ClearInterrupt() {
+  reinterpret_cast<i::Isolate*>(this)->stack_guard()->ClearInterrupt();
+}
+
+
 Isolate* Isolate::GetCurrent() {
   i::Isolate* isolate = i::Isolate::UncheckedCurrent();
   return reinterpret_cast<Isolate*>(isolate);
 }
 
 
 Isolate* Isolate::New() {
   i::Isolate* isolate = new i::Isolate();
   return reinterpret_cast<Isolate*>(isolate);
 }
@@ skipping 1045 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal