Allow backgrounding processes on Mac

content/public/common/content_features.h

 // 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.
 
 // This file defines all the public base::FeatureList features for the content
 // module.
 
 #ifndef CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 #define CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_
 
@@ skipping 53 matching lines @@
 CONTENT_EXPORT extern const base::Feature kAutoplayMutedVideos;
 CONTENT_EXPORT extern const base::Feature kImeThread;
 CONTENT_EXPORT extern const base::Feature kSeccompSandboxAndroid;
 CONTENT_EXPORT extern const base::Feature kWebPayments;
 #endif  // defined(OS_ANDROID)
 
 #if defined(OS_WIN)
 CONTENT_EXPORT extern const base::Feature kWinSboxDisableExtensionPoints;
 #endif  // defined(OS_WIN)
 
+#if defined(OS_MACOSX)
+CONTENT_EXPORT extern const base::Feature kMacBackgroundInactiveTabs;

[shrike, 2016/10/31 17:26:05]

Technically the renderers are hidden. I think it's better to call this
kMacBackgroundHiddenRenderers so that the feature name is as clear as can be
(when you switch to another tab, is the old tab really inactive? Yes and no,
because it still might be doing some work).

[lgrey, 2016/10/31 19:22:02]

Done.

+#endif
+
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace features
 
 #endif  // CONTENT_PUBLIC_COMMON_CONTENT_FEATURES_H_