PPAPI: Add PluginPrivateFileSystem

ppapi/proxy/file_system_resource.cc

Index: ppapi/proxy/file_system_resource.cc
diff --git a/ppapi/proxy/file_system_resource.cc b/ppapi/proxy/file_system_resource.cc
index 18399301309ae10ba0274b91d5602279fe3e9f93..df8c39077514efbefa963912d01c51ad7afd28a3 100644
--- a/ppapi/proxy/file_system_resource.cc
+++ b/ppapi/proxy/file_system_resource.cc
@@ -21,7 +21,8 @@ FileSystemResource::FileSystemResource(Connection connection,
     : PluginResource(connection, instance),
       type_(type),
       called_open_(false),
-      callback_count_(0) {
+      callback_count_(0),
+      callback_result_(PP_OK) {
   DCHECK(type_ != PP_FILESYSTEMTYPE_INVALID);
   SendCreate(RENDERER, PpapiHostMsg_FileSystem_Create(type_));
   SendCreate(BROWSER, PpapiHostMsg_FileSystem_Create(type_));
@@ -34,7 +35,9 @@ FileSystemResource::FileSystemResource(Connection connection,
                                        PP_FileSystemType type)
     : PluginResource(connection, instance),
       type_(type),
-      called_open_(true) {
+      called_open_(true),
+      callback_count_(0),
+      callback_result_(PP_OK) {
   DCHECK(type_ != PP_FILESYSTEMTYPE_INVALID);
   AttachToPendingHost(RENDERER, pending_renderer_id);
   AttachToPendingHost(BROWSER, pending_browser_id);
@@ -99,18 +102,24 @@ void FileSystemResource::OpenComplete(
     scoped_refptr<TrackedCallback> callback,
     const ResourceMessageReplyParams& params) {
   ++callback_count_;
+  // Prioritize worse result since only one status can be returned.
+  if (params.result() != PP_OK)
+    callback_result_ = params.result();
   // Received callback from browser and renderer.
   if (callback_count_ == 2)
-    callback->Run(params.result());
+    callback->Run(callback_result_);
 }
 
 void FileSystemResource::InitIsolatedFileSystemComplete(
     const base::Callback<void(int32_t)>& callback,
     const ResourceMessageReplyParams& params) {
   ++callback_count_;
+  // Prioritize worse result since only one status can be returned.
+  if (params.result() != PP_OK)
+    callback_result_ = params.result();
   // Received callback from browser and renderer.
   if (callback_count_ == 2)
-    callback.Run(params.result());
+    callback.Run(callback_result_);
 }
 
 }  // namespace proxy