Implement the filesystem proxy. This allows the FileRef tests to pass in the...

webkit/plugins/ppapi/ppb_file_ref_impl.cc

 // Copyright (c) 2010 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 "webkit/plugins/ppapi/ppb_file_ref_impl.h"
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "ppapi/c/pp_errors.h"
 #include "webkit/plugins/ppapi/common.h"
@@ skipping 50 matching lines @@
 }
 
 PP_Bool IsFileRef(PP_Resource resource) {
   return BoolToPPBool(!!Resource::GetAs<PPB_FileRef_Impl>(resource));
 }
 
 PP_FileSystemType_Dev GetFileSystemType(PP_Resource file_ref_id) {
   scoped_refptr<PPB_FileRef_Impl> file_ref(
       Resource::GetAs<PPB_FileRef_Impl>(file_ref_id));
   if (!file_ref)
-    return PP_FILESYSTEMTYPE_EXTERNAL;
+    return PP_FILESYSTEMTYPE_NONE;
   return file_ref->GetFileSystemType();
 }
 
 PP_Var GetName(PP_Resource file_ref_id) {
   scoped_refptr<PPB_FileRef_Impl> file_ref(
       Resource::GetAs<PPB_FileRef_Impl>(file_ref_id));
   if (!file_ref)
     return PP_MakeUndefined();
   return StringVar::StringToPPVar(file_ref->instance()->module(),
                                   file_ref->GetName());
@@ skipping 218 matching lines @@
   PPB_FileRef_Impl* parent_ref = new PPB_FileRef_Impl(instance(), file_system_,
                                                       parent_path);
   return parent_ref;
 }
 
 scoped_refptr<PPB_FileSystem_Impl> PPB_FileRef_Impl::GetFileSystem() const {
   return file_system_;
 }
 
 PP_FileSystemType_Dev PPB_FileRef_Impl::GetFileSystemType() const {
+  // When the file ref exists but there's no explicit filesystem object
+  // associated with it, that means it's an "external" filesystem.
   if (!file_system_)
     return PP_FILESYSTEMTYPE_EXTERNAL;
 
   return file_system_->type();
 }
 
 std::string PPB_FileRef_Impl::GetPath() const {
   return virtual_path_;
 }
 
@@ skipping 12 matching lines @@
 #else
 #error "Unsupported platform."
 #endif
   );
   return file_system_->root_path().Append(virtual_file_path);
 }
 
 }  // namespace ppapi
 }  // namespace webkit