Set V8 extras mode in gin::V8Initializer.

gin/public/isolate_holder.h

Index: gin/public/isolate_holder.h
diff --git a/gin/public/isolate_holder.h b/gin/public/isolate_holder.h
index f7e01e8aee80ba004942a71f49684df1642f156c..d43ffb2f5a4db810956aa98842d9665d6cd0f18a 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -35,6 +35,12 @@ class GIN_EXPORT IsolateHolder {
     kUseLocker
   };
 
+  // Indicates whether V8 works with stable or experimental v8 extras.
+  enum V8ExtrasMode {
+    kStableV8Extras,
+    kExperimentalV8Extras,

[domenic, 2015/12/02 18:07:23]

It'd be less confusing to name this kStableAndExperimentalV8Extras

[yhirano, 2015/12/03 02:21:05]

Done.

+  };
+
   IsolateHolder();
   explicit IsolateHolder(AccessMode access_mode);
   ~IsolateHolder();
@@ -48,7 +54,12 @@ class GIN_EXPORT IsolateHolder {
   // V8Initializer::LoadV8SnapshotFromFD or
   // V8Initializer::LoadV8Snapshot) before calling this method.
   static void Initialize(ScriptMode mode,
+                         V8ExtrasMode v8_extras_mode,
                          v8::ArrayBuffer::Allocator* allocator);
+  static void Initialize(ScriptMode mode,

[jochen (gone - plz use gerrit), 2015/12/02 13:09:18]

please add the parameter explicitly everywhere

[yhirano, 2015/12/03 02:21:05]

Done.

+                         v8::ArrayBuffer::Allocator* allocator) {
+    Initialize(mode, kStableV8Extras, allocator);
+  }
 
   v8::Isolate* isolate() { return isolate_; }