Enable SharedArrayBuffer feature by default.

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 196 matching lines @@
 // Scrolls to compensate for layout movements (bit.ly/scroll-anchoring).
 const base::Feature kScrollAnchoring{"ScrollAnchoring",
                                      base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Navigation preload feature of service workers.
 const base::Feature kServiceWorkerNavigationPreload{
     "ServiceWorkerNavigationPreload", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // http://tc39.github.io/ecmascript_sharedmem/shmem.html
 const base::Feature kSharedArrayBuffer{"SharedArrayBuffer",
-                                       base::FEATURE_DISABLED_BY_DEFAULT};
+                                       base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Paint invalidation based on slimming paint. See https://goo.gl/eQczQW
 const base::Feature kSlimmingPaintInvalidation{
     "SlimmingPaintInvalidation", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Throttle Blink timers in out-of-view cross origin frames.
 const base::Feature kTimerThrottlingForHiddenFrames{
     "TimerThrottlingForHiddenFrames", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables token binding
@@ skipping 95 matching lines @@
 #endif
 
 #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