Pepper: Add shared Utilities for file systems.

ppapi/shared_impl/file_system_util.cc

+// 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.
+
+#include "ppapi/shared_impl/file_system_util.h"
+
+namespace ppapi {
+
+fileapi::FileSystemType PepperFileSystemTypeToFileSystemType(
+    PP_FileSystemType type) {
+  switch (type) {
+    case PP_FILESYSTEMTYPE_LOCALTEMPORARY:
+      return fileapi::kFileSystemTypeTemporary;
+    case PP_FILESYSTEMTYPE_LOCALPERSISTENT:
+      return fileapi::kFileSystemTypePersistent;
+    case PP_FILESYSTEMTYPE_EXTERNAL:
+      return fileapi::kFileSystemTypeExternal;
+    default:
+      return fileapi::kFileSystemTypeUnknown;
+  }
+}
+
+bool FileSystemTypeIsValid(PP_FileSystemType type) {
+  return (type == PP_FILESYSTEMTYPE_LOCALPERSISTENT ||
+          type == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
+          type == PP_FILESYSTEMTYPE_EXTERNAL ||
+          type == PP_FILESYSTEMTYPE_ISOLATED);
+}
+
+bool FileSystemTypeHasQuota(PP_FileSystemType type) {
+  return (type == PP_FILESYSTEMTYPE_LOCALTEMPORARY ||
+          type == PP_FILESYSTEMTYPE_LOCALPERSISTENT);
+}
+
+}  // namespace ppapi