[SPDY] Add flag to turn on SPDY/3.1 (with per-session flow control)

net/http/http_stream_factory.cc

Index: net/http/http_stream_factory.cc
diff --git a/net/http/http_stream_factory.cc b/net/http/http_stream_factory.cc
index bd30444cbdd48ff2edf598f2f99cc1df6937f2c1..7b4e8c080d07fe380ff3d649f93fa3ae0419ac2f 100644
--- a/net/http/http_stream_factory.cc
+++ b/net/http/http_stream_factory.cc
@@ -169,6 +169,17 @@ void HttpStreamFactory::EnableNpnSpdy3() {
 }
 
 // static
+void HttpStreamFactory::EnableNpnSpdy31() {
+  set_use_alternate_protocols(true);
+  std::vector<std::string> next_protos;
+  next_protos.push_back("http/1.1");
+  next_protos.push_back("spdy/2");
+  next_protos.push_back("spdy/3");
+  next_protos.push_back("spdy/3.1");
+  SetNextProtos(next_protos);
+}
+
+// static
 void HttpStreamFactory::SetNextProtos(const std::vector<std::string>& value) {
   if (!next_protos_)
     next_protos_ = new std::vector<std::string>;
@@ -187,6 +198,8 @@ void HttpStreamFactory::SetNextProtos(const std::vector<std::string>& value) {
       enabled_protocols_[NPN_SPDY_2] = true;
     } else if (value[i] == "spdy/3") {
       enabled_protocols_[NPN_SPDY_3] = true;
+    } else if (value[i] == "spdy/3.1") {
+      enabled_protocols_[NPN_SPDY_3_1] = true;
     } else if (value[i] == "quic/1") {
       enabled_protocols_[QUIC_1] = true;
     }