Add embedder::AsyncWait()

mojo/edk/system/async_waiter.h

Index: mojo/edk/system/async_waiter.h
diff --git a/mojo/edk/system/async_waiter.h b/mojo/edk/system/async_waiter.h
new file mode 100644
index 0000000000000000000000000000000000000000..1cfb9f03c97c775dbc45a63ba352eb89bf7beaa5
--- /dev/null
+++ b/mojo/edk/system/async_waiter.h
@@ -0,0 +1,41 @@
+// 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_EDK_SYSTEM_ASYNC_WAITER_H_
+#define MOJO_EDK_SYSTEM_ASYNC_WAITER_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"

[viettrungluu, 2014/12/12 21:39:30]

Don't need this include.

[gmorrita, 2014/12/12 22:56:27]

Done.

+#include "mojo/edk/system/awakable.h"
+#include "mojo/edk/system/dispatcher.h"

[viettrungluu, 2014/12/12 21:39:31]

Nor this.

[gmorrita, 2014/12/12 22:56:27]

Done.

+#include "mojo/edk/system/handle_signals_state.h"

[viettrungluu, 2014/12/12 21:39:31]

"

[gmorrita, 2014/12/12 22:56:27]

Done.

+#include "mojo/edk/system/system_impl_export.h"
+#include "mojo/public/c/system/types.h"
+
+namespace mojo {
+namespace system {
+
+// An |Awakable| implementation that just calls a given callback object.
+class MOJO_SYSTEM_IMPL_EXPORT AsyncWaiter : public Awakable {
+ public:
+  typedef base::Callback<void(MojoResult)> AwakeCallback;
+
+  // |callback| must satisfy the same contract as |Awakable::Awake()|.
+  AsyncWaiter(AwakeCallback callback);

[viettrungluu, 2014/12/12 21:39:31]

explicit

[gmorrita, 2014/12/12 22:56:28]

Done.

+  virtual ~AsyncWaiter();

[viettrungluu, 2014/12/12 21:39:31]

This doesn't need to be virtual. (Possibly, you should declare this class to be
final.)

[gmorrita, 2014/12/12 22:56:27]

Our clang plugin complains about this :-/

+
+ private:
+  // |Awakable| implementation:
+  bool Awake(MojoResult result, uintptr_t context) override;
+
+  AwakeCallback callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(AsyncWaiter);
+};
+
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_ASYNC_WAITER_H_