PPAPI: Add PluginPrivateFileSystem

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"
+
+#include "base/logging.h"
+
+namespace ppapi {
+
+std::string IsolatedFileSystemTypeToRootName(
+    PP_IsolatedFileSystemType_Private type) {
+  switch (type) {
+    case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_INVALID:

[teravest, 2013/11/12 18:04:53]

Why bother explicitly handling this case?

[nhiroki, 2013/11/14 11:34:39]

It's just my preference ('default' could hide newly added types on compile
time).

+      break;
+    case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_CRX:
+      return "crxfs";
+    case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE:
+      return "pluginprivate";
+  }
+  NOTREACHED() << type;
+  return std::string();
+}
+
+}  // namespace ppapi