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diff --git a/mojo/edk/js/handle.h b/mojo/edk/js/handle.h
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+++ b/mojo/edk/js/handle.h
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+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_EDK_JS_HANDLE_H_
+#define MOJO_EDK_JS_HANDLE_H_
+
+#include <stdint.h>
+
+#include "base/observer_list.h"
+#include "gin/converter.h"
+#include "gin/handle.h"
+#include "gin/wrappable.h"
+#include "mojo/edk/js/js_export.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace mojo {
+namespace edk {
+namespace js {
+
+class HandleCloseObserver;
+
+// Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
+// is Closed when its JS object is garbage collected.
+class MOJO_JS_EXPORT HandleWrapper : public gin::Wrappable<HandleWrapper> {
+ public:
+  static gin::WrapperInfo kWrapperInfo;
+
+  static gin::Handle<HandleWrapper> Create(v8::Isolate* isolate,
+                                           MojoHandle handle) {
+    return gin::CreateHandle(isolate, new HandleWrapper(handle));
+  }
+
+  mojo::Handle get() const { return handle_.get(); }
+  mojo::Handle release() { return handle_.release(); }
+  void Close();
+
+  void AddCloseObserver(HandleCloseObserver* observer);
+  void RemoveCloseObserver(HandleCloseObserver* observer);
+
+ protected:
+  HandleWrapper(MojoHandle handle);
+  ~HandleWrapper() override;
+  void NotifyCloseObservers();
+
+  mojo::ScopedHandle handle_;
+  base::ObserverList<HandleCloseObserver> close_observers_;
+};
+
+}  // namespace js
+}  // namespace edk
+}  // namespace mojo
+
+namespace gin {
+
+// Note: It's important to use this converter rather than the one for
+// MojoHandle, since that will do a simple int32_t conversion. It's unfortunate
+// there's no way to prevent against accidental use.
+// TODO(mpcomplete): define converters for all Handle subtypes.
+template <>
+struct MOJO_JS_EXPORT Converter<mojo::Handle> {
+  static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
+                                    const mojo::Handle& val);
+  static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
+                     mojo::Handle* out);
+};
+
+template <>
+struct MOJO_JS_EXPORT Converter<mojo::MessagePipeHandle> {
+  static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
+                                    mojo::MessagePipeHandle val);
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Handle<v8::Value> val,
+                     mojo::MessagePipeHandle* out);
+};
+
+// We need to specialize the normal gin::Handle converter in order to handle
+// converting |null| to a wrapper for an empty mojo::Handle.
+template <>
+struct MOJO_JS_EXPORT Converter<gin::Handle<mojo::edk::js::HandleWrapper>> {
+  static v8::Handle<v8::Value> ToV8(
+      v8::Isolate* isolate,
+      const gin::Handle<mojo::edk::js::HandleWrapper>& val) {
+    return val.ToV8();
+  }
+
+  static bool FromV8(v8::Isolate* isolate,
+                     v8::Handle<v8::Value> val,
+                     gin::Handle<mojo::edk::js::HandleWrapper>* out) {
+    if (val->IsNull()) {
+      *out = mojo::edk::js::HandleWrapper::Create(isolate, MOJO_HANDLE_INVALID);
+      return true;
+    }
+
+    mojo::edk::js::HandleWrapper* object = NULL;
+    if (!Converter<mojo::edk::js::HandleWrapper*>::FromV8(isolate, val,
+                                                          &object)) {
+      return false;
+    }
+    *out = gin::Handle<mojo::edk::js::HandleWrapper>(val, object);
+    return true;
+  }
+};
+
+}  // namespace gin
+
+#endif  // MOJO_EDK_JS_HANDLE_H_