gin: Make it possible to use gin array buffers when running on top of blink

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 d68e4d5a58b72e28c0930fafe5cb0e6ae5c2c3ac..67c23358c87a051c9a7d0eb3e81c0e6cbbb6cbd0 100644
--- a/gin/public/isolate_holder.h
+++ b/gin/public/isolate_holder.h
@@ -8,10 +8,7 @@
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "gin/gin_export.h"
-
-namespace v8 {
-class Isolate;
-}
+#include "v8/include/v8.h"
 
 namespace gin {
 
@@ -30,6 +27,9 @@ class PerIsolateData;
 class GIN_EXPORT IsolateHolder {
  public:
   IsolateHolder();
+  IsolateHolder(v8::Isolate* isolate, v8::ArrayBuffer::Allocator* allocator);
+
+  // TODO(jochen): Remove.
   explicit IsolateHolder(v8::Isolate* isolate);
 
   ~IsolateHolder();
@@ -37,7 +37,7 @@ class GIN_EXPORT IsolateHolder {
   v8::Isolate* isolate() { return isolate_; }
 
  private:
-  void Init();
+  void Init(v8::ArrayBuffer::Allocator* allocator);
 
   bool isolate_owner_;
   v8::Isolate* isolate_;