Enable PassiveDocumentEventListeners 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 @@
 const base::Feature kParseHTMLOnMainThread{"ParseHTMLOnMainThread",
                                            base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Whether document level event listeners should default 'passive' to true.
 const base::Feature kPassiveDocumentEventListeners{
     "PassiveDocumentEventListeners", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Whether we should force a touchstart and first touchmove per scroll event
 // listeners to be 'passive' during fling.
 const base::Feature kPassiveEventListenersDueToFling{
-    "PassiveEventListenersDueToFling", base::FEATURE_DISABLED_BY_DEFAULT};
+    "PassiveEventListenersDueToFling", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Pointer events support.
 const base::Feature kPointerEvents{"PointerEvent",
                                    base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables purge and suspend.
 const base::Feature kPurgeAndSuspend{"PurgeAndSuspend",
                                      base::FEATURE_DISABLED_BY_DEFAULT};
 
 // RAF aligned mouse input events support.
@@ skipping 113 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