Support tasks injection into a running VM.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6996 matching lines @@
   return internal_isolate->stack_guard()->CheckDebugBreak();
 }
 
 
 void Debug::DebugBreakForCommand(Isolate* isolate, ClientData* data) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   internal_isolate->debug()->EnqueueDebugCommand(data);
 }
 
 
+void Debug::BreakAndRun(Isolate* isolate, Task* task) {
+  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  internal_isolate->debug()->EnqueueEmbedderTask(task);
+}
+
+
 void Debug::SetMessageHandler(v8::Debug::MessageHandler handler) {
   i::Isolate* isolate = i::Isolate::Current();
   ENTER_V8(isolate);
   isolate->debug()->SetMessageHandler(handler);
 }
 
 
 void Debug::SendCommand(Isolate* isolate,
                         const uint16_t* command,
                         int length,
@@ skipping 47 matching lines @@
     v8::Handle<v8::Value> argv[kArgc] = { obj };
     result = v8_fun->Call(Utils::ToLocal(debug), kArgc, argv);
     has_pending_exception = result.IsEmpty();
   }
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Value>());
   return scope.Escape(result);
 }
 
 
 void Debug::ProcessDebugMessages() {
-  i::Isolate::Current()->debug()->ProcessDebugMessages(true);
+  i::Debug* isolate_debug = i::Isolate::Current()->debug();
+  isolate_debug->ProcessEmbedderTasks();
+  isolate_debug->ProcessDebugMessages(true);
 }
 
 
 Local<Context> Debug::GetDebugContext() {
   i::Isolate* isolate = i::Isolate::Current();
   ENTER_V8(isolate);
   return Utils::ToLocal(i::Isolate::Current()->debug()->GetDebugContext());
 }
 
 
@@ skipping 659 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