Support tasks injection into a running VM.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index d094dbd55c4cf9f20e4ee3caf48bf846333152d5..6fe20e5ed6dc9ad111eba775847f74f78a159180 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7014,6 +7014,12 @@ void Debug::DebugBreakForCommand(Isolate* isolate, ClientData* 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);
@@ -7081,7 +7087,9 @@ Local<Value> Debug::GetMirror(v8::Handle<v8::Value> obj) {
 
 
 void Debug::ProcessDebugMessages() {
-  i::Isolate::Current()->debug()->ProcessDebugMessages(true);
+  i::Debug* isolate_debug = i::Isolate::Current()->debug();
+  isolate_debug->ProcessEmbedderTasks();
+  isolate_debug->ProcessDebugMessages(true);
 }