Add forwarder2

tools/android/forwarder2/pipe_notifier.h

Index: tools/android/forwarder2/pipe_notifier.h
diff --git a/tools/android/forwarder2/pipe_notifier.h b/tools/android/forwarder2/pipe_notifier.h
new file mode 100644
index 0000000000000000000000000000000000000000..7725270cf53fb12858d4dc3eaaab45bf028bb8e6
--- /dev/null
+++ b/tools/android/forwarder2/pipe_notifier.h
@@ -0,0 +1,32 @@
+// Copyright (c) 2012 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 TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_
+#define TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_
+
+#include <pthread.h>
+
+#include "base/basictypes.h"
+
+namespace forwarder {
+
+class PipeNotifier {
+ public:
+  PipeNotifier();
+  ~PipeNotifier();
+
+  bool Notify();
+
+  int receiver_fd() const { return receiver_fd_; }
+
+ private:
+  int sender_fd_;
+  int receiver_fd_;
+
+  DISALLOW_COPY_AND_ASSIGN(PipeNotifier);
+};
+
+}  // namespace forwarder
+
+#endif  // TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_