Introduce OffMainThreadFetch feature

content/public/common/content_features.cc

 // Copyright 2015 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 "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 118 matching lines @@
 };
 
 // Kill switch for Web Notification content images.
 const base::Feature kNotificationContentImage{"NotificationContentImage",
                                               base::FEATURE_ENABLED_BY_DEFAULT};
 // An experiment forcing events to be non-blocking when the main thread is
 // deemed unresponsive.  See crbug.com/599609.
 const base::Feature kMainThreadBusyScrollIntervention{
     "MainThreadBusyScrollIntervention", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Experimental resource fetch optimizations for workers. See crbug.com/443374
+const base::Feature kOffMainThreadFetch{"OffMainThreadFetch",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Origin Trials for controlling access to feature/API experiments.
 const base::Feature kOriginTrials{"OriginTrials",
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Whether a download can be handled by parallel jobs.
 const base::Feature kParallelDownloading{
     "ParallelDownloading", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Whether document level event listeners should default 'passive' to true.
 const base::Feature kPassiveDocumentEventListeners{
@@ skipping 162 matching lines @@
 #endif  // !defined(OS_ANDROID)
 
 #if defined(OS_WIN)
 // Emergency "off switch" for new Windows sandbox security mitigation,
 // sandbox::MITIGATION_EXTENSION_POINT_DISABLE.
 const base::Feature kWinSboxDisableExtensionPoints{
     "WinSboxDisableExtensionPoint", base::FEATURE_ENABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features