Add command-line control of the HSTS preload list.

net/base/transport_security_state.h

Index: net/base/transport_security_state.h
===================================================================
--- net/base/transport_security_state.h	(revision 81709)
+++ net/base/transport_security_state.h	(working copy)
@@ -31,19 +31,21 @@
   // A DomainState is the information that we persist about a given domain.
   struct DomainState {
     enum Mode {
+      // None means there is no HSTS for this domain.
+      MODE_NONE = 0,
       // Strict mode implies:
       //   * We generate internal redirects from HTTP -> HTTPS.
       //   * Certificate issues are fatal.
-      MODE_STRICT = 0,
+      MODE_STRICT = 1,
       // Opportunistic mode implies:
       //   * We'll request HTTP URLs over HTTPS
       //   * Certificate issues are ignored.
-      MODE_OPPORTUNISTIC = 1,
+      MODE_OPPORTUNISTIC = 2,
       // SPDY_ONLY (aka X-Bodge-Transport-Security) is a hopefully temporary
       // measure. It implies:
       //   * We'll request HTTP URLs over HTTPS iff we have SPDY support.
       //   * Certificate issues are fatal.
-      MODE_SPDY_ONLY = 2,
+      MODE_SPDY_ONLY = 3,
     };
 
     DomainState();
@@ -122,7 +124,7 @@
   static std::string CanonicalizeHost(const std::string& host);
   static bool IsPreloadedSTS(const std::string& canonicalized_host,
                              bool sni_available,
-                             bool* out_include_subdomains);
+                             DomainState* out);
 
   // The set of hosts that have enabled TransportSecurity. The keys here
   // are SHA256(DNSForm(domain)) where DNSForm converts from dotted form