Introduce a microtask suppression scope and move microtask methods to isolate

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 82e4c54ba517e606257d0e5a73c27890d6348f51..41b5a45a70ebf78e86d271b1c68df2ddd29dd1d8 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6455,21 +6455,17 @@ void V8::RemoveMemoryAllocationCallback(MemoryAllocationCallback callback) {
 
 
 void V8::RunMicrotasks(Isolate* isolate) {
-  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
-  i::HandleScope scope(i_isolate);
-  i::V8::RunMicrotasks(i_isolate);
+  isolate->RunMicrotasks();
 }
 
 
 void V8::EnqueueMicrotask(Isolate* isolate, Handle<Function> microtask) {
-  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
-  ENTER_V8(i_isolate);
-  i::Execution::EnqueueMicrotask(i_isolate, Utils::OpenHandle(*microtask));
+  isolate->EnqueueMicrotask(microtask);
 }
 
 
 void V8::SetAutorunMicrotasks(Isolate* isolate, bool autorun) {
-  reinterpret_cast<i::Isolate*>(isolate)->set_autorun_microtasks(autorun);
+  isolate->SetAutorunMicrotasks(autorun);
 }
 
 
@@ -6593,6 +6589,18 @@ Isolate::AllowJavascriptExecutionScope::~AllowJavascriptExecutionScope() {
 }
 
 
+Isolate::SuppressMicrotaskExecutionScope::SuppressMicrotaskExecutionScope(
+    Isolate* isolate)
+    : isolate_(reinterpret_cast<i::Isolate*>(isolate)) {
+  isolate_->handle_scope_implementer()->IncrementCallDepth();
+}
+
+
+Isolate::SuppressMicrotaskExecutionScope::~SuppressMicrotaskExecutionScope() {
+  isolate_->handle_scope_implementer()->DecrementCallDepth();
+}
+
+
 void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
   if (!isolate->IsInitialized()) {
@@ -6632,6 +6640,25 @@ void Isolate::RemoveCallCompletedCallback(CallCompletedCallback callback) {
 }
 
 
+void Isolate::RunMicrotasks() {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
+  i::HandleScope scope(i_isolate);
+  i_isolate->RunMicrotasks();
+}
+
+
+void Isolate::EnqueueMicrotask(Handle<Function> microtask) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(this);
+  ENTER_V8(i_isolate);
+  i::Execution::EnqueueMicrotask(i_isolate, Utils::OpenHandle(*microtask));
+}
+
+
+void Isolate::SetAutorunMicrotasks(bool autorun) {
+  reinterpret_cast<i::Isolate*>(this)->set_autorun_microtasks(autorun);
+}
+
+
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();