Add PPB_Alarms_Dev interface definition.

ppapi/c/dev/pp_optional_structs_dev.h

Index: ppapi/c/dev/pp_optional_structs_dev.h
diff --git a/ppapi/c/dev/pp_optional_structs_dev.h b/ppapi/c/dev/pp_optional_structs_dev.h
new file mode 100644
index 0000000000000000000000000000000000000000..b408c00becd5685d13ef0bcc4dc2ba7d1d2d9be1
--- /dev/null
+++ b/ppapi/c/dev/pp_optional_structs_dev.h
@@ -0,0 +1,34 @@
+/* Copyright (c) 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.
+ */
+
+/* From dev/pp_optional_structs_dev.idl modified Wed Dec 04 15:50:09 2013. */
+
+#ifndef PPAPI_C_DEV_PP_OPTIONAL_STRUCTS_DEV_H_
+#define PPAPI_C_DEV_PP_OPTIONAL_STRUCTS_DEV_H_
+
+#include "ppapi/c/pp_bool.h"
+#include "ppapi/c/pp_macros.h"
+#include "ppapi/c/pp_stdint.h"
+
+/**
+ * @file
+ * This file defines optional structs for primitive types.
+ */
+
+
+/**
+ * @addtogroup Structs
+ * @{
+ */
+struct PP_Optional_Double {
+  double value;
+  PP_Bool is_set;
+};
+/**
+ * @}
+ */
+
+#endif  /* PPAPI_C_DEV_PP_OPTIONAL_STRUCTS_DEV_H_ */
+