Add a build flag to configure bundling of HSTS preload list

net/features.gni

Index: net/features.gni
diff --git a/net/features.gni b/net/features.gni
index 12ba0e011c2f0893940ef0394d289251e5e7b21b..27d7b7506d1837bc1dc2b3a9eaf91c954b47225e 100644
--- a/net/features.gni
+++ b/net/features.gni
@@ -27,4 +27,7 @@ declare_args() {
 
   # Multicast DNS.
   enable_mdns = is_win || is_linux
+
+  # Whether transport security preload list should be included.

[Ryan Sleevi, 2017/06/29 20:47:40]

Can we provide any better documentation here about the risks/tradeoffs and/or
general advice not to change this?

[xunjieli, 2017/06/30 19:12:18]

Done.

+  include_transport_security_state_preload_list = true
 }