WIP SharedArrayBuffer implementation

src/v8.h

Index: src/v8.h
diff --git a/src/v8.h b/src/v8.h
index 211f3c6141a79650fa798ef9351e1276a24486c8..d60c77390a2ad13cadfb08b18b9430e29c38db23 100644
--- a/src/v8.h
+++ b/src/v8.h
@@ -78,6 +78,16 @@ class V8 : public AllStatic {
     array_buffer_allocator_ = allocator;
   }
 
+  static v8::SharedArrayBuffer::Allocator* SharedArrayBufferAllocator() {
+    return shared_array_buffer_allocator_;
+  }
+
+  static void SetSharedArrayBufferAllocator(
+      v8::SharedArrayBuffer::Allocator* allocator) {
+    CHECK_NULL(shared_array_buffer_allocator_);
+    shared_array_buffer_allocator_ = allocator;
+  }
+
   static void InitializePlatform(v8::Platform* platform);
   static void ShutdownPlatform();
   static v8::Platform* GetCurrentPlatform();
@@ -91,6 +101,8 @@ class V8 : public AllStatic {
 
   // Allocator for external array buffers.
   static v8::ArrayBuffer::Allocator* array_buffer_allocator_;
+  // Allocator for external shared array buffers.
+  static v8::SharedArrayBuffer::Allocator* shared_array_buffer_allocator_;
   // v8::Platform to use.
   static v8::Platform* platform_;
 };