1 files changed, 75 insertions, 0 deletions
diff --git a/chromium/mojo/bindings/js/handle.h b/chromium/mojo/bindings/js/handle.h
new file mode 100644
index 00000000000..35202b07ea6
--- /dev/null
+++ b/chromium/mojo/bindings/js/handle.h
@@ -0,0 +1,75 @@
+// 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_BINDINGS_JS_HANDLE_H_
+#define MOJO_BINDINGS_JS_HANDLE_H_
+
+#include "gin/converter.h"
+#include "gin/handle.h"
+#include "gin/wrappable.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace gin {
+
+// Wrapper for mojo Handles exposed to JavaScript. This ensures the Handle
+// is Closed when its JS object is garbage collected.
+class 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() { handle_.reset(); }
+
+ protected:
+  HandleWrapper(MojoHandle handle);
+  virtual ~HandleWrapper();
+  mojo::ScopedHandle handle_;
+};
+
+// Note: It's important to use this converter rather than the one for
+// MojoHandle, since that will do a simple int32 conversion. It's unfortunate
+// there's no way to prevent against accidental use.
+// TODO(mpcomplete): define converters for all Handle subtypes.
+template<>
+struct 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);
+};
+
+// 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 Converter<gin::Handle<gin::HandleWrapper> > {
+  static v8::Handle<v8::Value> ToV8(
+        v8::Isolate* isolate, const gin::Handle<gin::HandleWrapper>& val) {
+    return val.ToV8();
+  }
+
+  static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
+                     gin::Handle<gin::HandleWrapper>* out) {
+    if (val->IsNull()) {
+      *out = HandleWrapper::Create(isolate, MOJO_HANDLE_INVALID);
+      return true;
+    }
+
+    gin::HandleWrapper* object = NULL;
+    if (!Converter<gin::HandleWrapper*>::FromV8(isolate, val, &object)) {
+      return false;
+    }
+    *out = gin::Handle<gin::HandleWrapper>(val, object);
+    return true;
+  }
+};
+
+}  // namespace gin
+
+#endif  // MOJO_BINDINGS_JS_HANDLE_H_