[TooManyTabs] Add TabNavigationThrottle

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index 1b66b3452b24db8541893e804fdd8011b5b68c53..c268f31029abd69c9b0437f3c6fbcae9bc3ac6b2 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -354,6 +354,11 @@ const base::Feature kSimplifiedFullscreenUI{"ViewsSimplifiedFullscreenUI",
 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",