[gin] Turn gin into a component

gin/array_buffer.cc

Index: gin/array_buffer.cc
diff --git a/gin/array_buffer.cc b/gin/array_buffer.cc
index e8e234e5db1a21a16407319e5c36bcb8d6ecde73..ee9f2a5867b21a970daec17881ba4411a2631762 100644
--- a/gin/array_buffer.cc
+++ b/gin/array_buffer.cc
@@ -127,6 +127,13 @@ ArrayBuffer::ArrayBuffer(v8::Isolate* isolate,
 ArrayBuffer::~ArrayBuffer() {
 }
 
+ArrayBuffer& ArrayBuffer::operator=(const ArrayBuffer& other) {
+  private_ = other.private_;
+  bytes_ = other.bytes_;
+  num_bytes_ = other.num_bytes_;
+  return *this;
+}
+
 // Converter<ArrayBuffer> -----------------------------------------------------
 
 bool Converter<ArrayBuffer>::FromV8(v8::Isolate* isolate,