Mojo: Add BindingsSupportImpl on top of HandleWatcher

mojo/common/bindings_support_impl.h

+// Copyright 2013 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_COMMON_BINDINGS_SUPPORT_IMPL_H_
+#define MOJO_COMMON_BINDINGS_SUPPORT_IMPL_H_
+
+#include "mojo/public/bindings/lib/bindings_support.h"
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/common/mojo_common_export.h"
+
+namespace mojo {
+namespace common {
+
+class MOJO_COMMON_EXPORT BindingsSupportImpl
+    : NON_EXPORTED_BASE(public BindingsSupport) {
+ public:
+  BindingsSupportImpl();
+  virtual ~BindingsSupportImpl();
+
+  // BindingsSupport methods:
+  virtual AsyncWaitID AsyncWait(Handle handle, MojoWaitFlags flags,
+                                AsyncWaitCallback* callback) OVERRIDE;
+  virtual void CancelWait(AsyncWaitID async_wait_id) OVERRIDE;
+
+ private:
+  class Context;
+  scoped_refptr<Context> context_;
+
+  DISALLOW_COPY_AND_ASSIGN(BindingsSupportImpl);
+};
+
+}  // namespace common
+}  // namespace mojo
+
+#endif  // MOJO_COMMON_BINDINGS_SUPPORT_IMPL_H_