[TooManyTabs] Add TabNavigationThrottle

chrome/common/chrome_features.cc

 // Copyright 2016 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/common/chrome_features.h"
 
 #include "base/command_line.h"
 #include "chrome/common/chrome_switches.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
@@ skipping 336 matching lines @@
 // A new user experience for transitioning into fullscreen and mouse pointer
 // lock states.
 const base::Feature kSimplifiedFullscreenUI{"ViewsSimplifiedFullscreenUI",
                                             base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Enables or disables UI in MD Settings to view content settings grouped by
 // origin.
 const base::Feature kSiteDetails{"SiteDetails",
                                  base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables delaying background tabs' opening process in order to improve

[Charlie Reis, 2017/07/06 23:50:31]

nit: "process" is ambiguous here (vs RenderProcessHost).  Maybe "Enables
delaying the first navigation in background tabs in order to..."?

[Zhen Wang, 2017/07/07 18:06:39]

Updated

+// foreground tab's user experience.
+const base::Feature kStaggeredBackgroundTabOpen{
+    "StaggeredBackgroundTabOpen", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables or disables the creation of (legacy) supervised users. Does not
 // affect existing supervised users.
 const base::Feature kSupervisedUserCreation{"SupervisedUserCreation",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
 #if defined(SYZYASAN)
 // Enable the deferred free mechanism in the syzyasan module, which helps the
 // performance by deferring some work on the critical path to a background
 // thread.
 const base::Feature kSyzyasanDeferredFree{"SyzyasanDeferredFree",
@@ skipping 52 matching lines @@
   return base::FeatureList::IsEnabled(features::kPrefService) ||
 #if BUILDFLAG(ENABLE_PACKAGE_MASH_SERVICES)
          base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
              switches::kMusConfig) == switches::kMash;
 #else
          false;
 #endif
 }
 
 }  // namespace features