Adding field to tell if gin::IsolateHolder needs lock to be accessed.

gin/isolate_holder.cc

Index: gin/isolate_holder.cc
diff --git a/gin/isolate_holder.cc b/gin/isolate_holder.cc
index 9ef41d374a0625296ab82a5e02b995ffc9383274..60a1f8b2c33d20b70ec08cfc3f56ba7b4043f392 100644
--- a/gin/isolate_holder.cc
+++ b/gin/isolate_holder.cc
@@ -22,7 +22,10 @@ namespace {
 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = nullptr;
 }  // namespace
 
-IsolateHolder::IsolateHolder() {
+IsolateHolder::IsolateHolder() : IsolateHolder(LockMode::kDirectAccess) {
+}
+
+IsolateHolder::IsolateHolder(LockMode lock_mode) : lock_mode_(lock_mode) {
   v8::ArrayBuffer::Allocator* allocator = g_array_buffer_allocator;
   CHECK(allocator) << "You need to invoke gin::IsolateHolder::Initialize first";
   v8::Isolate::CreateParams params;
@@ -84,4 +87,8 @@ void IsolateHolder::RemoveRunMicrotasksObserver() {
   task_observer_.reset();
 }
 
+bool IsolateHolder::UseLock() {

[Primiano Tucci (use gerrit), 2015/04/23 15:52:40]

At this point, since you introduced an enum, I'd just return the enum

[ssid, 2015/04/23 16:24:56]

Done.

+  return lock_mode_ == LockMode::kLockToAccess;
+}
+
 }  // namespace gin