Add systeminfo.storage API implementation skeleton

chrome/browser/extensions/api/system_info_storage/storage_info_provider.h

Index: chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
diff --git a/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..18f0e6f7da007c331caebf92c55481464f05d9c1
--- /dev/null
+++ b/chrome/browser/extensions/api/system_info_storage/storage_info_provider.h
@@ -0,0 +1,41 @@
+// 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 CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_H_
+#define CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_H_
+
+#include "chrome/common/extensions/api/experimental_system_info_storage.h"
+
+namespace extensions {
+namespace systeminfo {
+
+// TODO(hmin): Here the storage type is declared as string type due to the IDL
+// doesn't support enum type yet. Once http://crbug.com/141940 is fixed, we
+// could reuse enum values generated by IDL compiler.
+
+// Unknown storage type.
+extern const char kStorageTypeUnknown[];
+// Hard disk.
+extern const char kStorageTypeHardDisk[];
+// Removable storage, e.g. USB device, flash card reader.
+extern const char kStorageTypeRemovable[];
+}  // namespace systeminfo
+
+// An interface for retrieving storage information on different platforms.
+class StorageInfoProvider {
+ public:
+   // Return a StorageInfoProvider instance. The caller is responsible for
+   // destroying it.
+   static StorageInfoProvider* Create();
+
+   virtual ~StorageInfoProvider() {}
+
+   // Return true if succeed to get storage information. Should be implemented
+   // on different platforms.
+   virtual bool GetStorageInfo(
+       api::experimental_system_info_storage::StorageInfo* info) = 0;
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_BROWSER_EXTENSIONS_API_SYSTEM_INFO_STORAGE_STORAGE_INFO_PROVIDER_H_