Add systeminfo.storage API implementation skeleton

chrome/common/extensions/api/experimental_systeminfo_storage.idl

Index: chrome/common/extensions/api/experimental_systeminfo_storage.idl
diff --git a/chrome/common/extensions/api/experimental_systeminfo_storage.idl b/chrome/common/extensions/api/experimental_systeminfo_storage.idl
new file mode 100644
index 0000000000000000000000000000000000000000..3160a4607aa122427f2790cb20a4daeb8ea25cd3
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+++ b/chrome/common/extensions/api/experimental_systeminfo_storage.idl
@@ -0,0 +1,64 @@
+// 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.
+
+namespace experimental.systeminfo.storage {
+
+  enum StorageUnitType {
+    // Unknow storage type.
+    unknown,
+    // Hard disk.
+    harddisk,
+    // Removable storage, e.g.USB device.
+    removable
+  };
+
+  dictionary StorageUnitInfo {
+    // The unique id of the storage unit.
+    DOMString id;
+    // The type of storage device. The value is one of the constants defined
+    // for this type.
+    StorageUnitType type;
+    // The total amount of the storage space, in bytes.
+    double capacity;
+    // The available amount of the storage space, in bytes.
+    double availableCapacity;
+  };
+
+  dictionary StorageInfo {
+    // The array of storage units connected to the system.
+    StorageUnitInfo[] units;
+  };
+
+  dictionary StorageUnitChangeInfo {
+    // The unique ID of storage unit on which the change is taken place.
+    DOMString id;
+    // The changed availableCapacity attribute.
+    double availableCapacity;
+  };
+
+  callback StorageInfoCallback = void (StorageInfo info);
+  callback StorageUnitChangeCallback = void (StorageUnitChangeInfo unit);
+
+  interface Functions {
+    // Get the storage information from the system.
+    static void get(StorageInfoCallback callback);
+  };
+
+  interface Events {
+    // Fired when the specified storage unit information is updated.
+    // |info| : The changed information for the specified storage unit.
+    static void onChanged(StorageUnitChangeInfo info);
+
+    // Fired when a new storage unit is added to the system,
+    // i.e. a new USB disk is plugged in.
+    // |unit| : The information of the new storage unit.
+    static void onAdded(StorageUnitInfo unit);
+
+    // Fired when a storage unit is removed from the system
+    // i.e. a USB disk is unplugged.
+    // |id| : The unique ID of storage unit already removed.
+    static void onRemoved(DOMString id);
+  };
+};
+