[fsp] Add throttling for number of opened files.

chrome/browser/chromeos/file_system_provider/service.cc

 // Copyright 2014 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 "chrome/browser/chromeos/file_system_provider/service.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system.h"
 #include "chrome/browser/chromeos/file_system_provider/provided_file_system_info.h"
 #include "chrome/browser/chromeos/file_system_provider/registry.h"
 #include "chrome/browser/chromeos/file_system_provider/registry_interface.h"
 #include "chrome/browser/chromeos/file_system_provider/service_factory.h"
+#include "chrome/browser/chromeos/file_system_provider/throttled_file_system.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/browser/extension_system.h"
 #include "storage/browser/fileapi/external_mount_points.h"
 #include "storage/common/fileapi/file_system_mount_option.h"
 
 namespace chromeos {
 namespace file_system_provider {
 namespace {
 
 // Maximum number of file systems to be mounted in the same time, per profile.
 const size_t kMaxFileSystems = 16;
 
 // Default factory for provided file systems. |profile| must not be NULL.
 ProvidedFileSystemInterface* CreateProvidedFileSystem(
     Profile* profile,
     const ProvidedFileSystemInfo& file_system_info) {
   DCHECK(profile);
-  return new ProvidedFileSystem(profile, file_system_info);
+  return new ThrottledFileSystem(
+      make_scoped_ptr(new ProvidedFileSystem(profile, file_system_info)));
 }
 
 }  // namespace
 
 Service::Service(Profile* profile,
                  extensions::ExtensionRegistry* extension_registry)
     : profile_(profile),
       extension_registry_(extension_registry),
       file_system_factory_(base::Bind(&CreateProvidedFileSystem)),
       registry_(new Registry(profile)),
@@ skipping 318 matching lines @@
 }
 
 void Service::OnWatcherListChanged(
     const ProvidedFileSystemInfo& file_system_info,
     const Watchers& watchers) {
   registry_->RememberFileSystem(file_system_info, watchers);
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos