Add a probability to Alternate-Protocol support.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 4c8135fd6443670b125e36afa32955dc0f44b588..c2f00c3e859dabf95e8028ce68e1dadac1cb6ad8 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -52,6 +52,12 @@ const char kAllowOutdatedPlugins[]          = "allow-outdated-plugins";
 // URLs. This provides an override to get the old insecure behavior.
 const char kAllowRunningInsecureContent[]   = "allow-running-insecure-content";
 
+// Specifies the threshold to be used when determining of an Alternate-Protocol
+// advertisement will be honored. If the advertised probability is larger
+// than the threshold, then it will be honored.
+const char kAlternateProtocolProbabilityThreshold[] =
+    "alternate-protocol-probability-threshold";

[Lei Zhang, 2014/06/30 19:09:24]

Is "alternative protocol" too generic? Do you want quic in the name somewhere?

[Ryan Hamilton, 2014/06/30 21:33:01]

Alternate Protocol is actually not QUIC specific (it applies to any other
protocol like SPDY or HTTP2, as well) so I think QUIC probably does not belong
in the name.

+
 // Prevents Chrome from requiring authorization to run certain widely installed
 // but less commonly used plug-ins.
 const char kAlwaysAuthorizePlugins[]        = "always-authorize-plugins";