[SPDY] Add flag and about:flags entry for SPDY/4 alpha 1

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 855be1161a673b02642ba512b8708512302a66b6..8432fb64083d353d076c56149bb9eb075ab3c6c8 100644
--- a/net/http/http_stream_factory.cc
+++ b/net/http/http_stream_factory.cc
@@ -180,6 +180,18 @@ void HttpStreamFactory::EnableNpnSpdy31() {
 }
 
 // static
+void HttpStreamFactory::EnableNpnSpdy4a1() {
+  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");
+  next_protos.push_back("spdy/4a1");
+  SetNextProtos(next_protos);
+}
+
+// static
 void HttpStreamFactory::SetNextProtos(const std::vector<std::string>& value) {
   if (!next_protos_)
     next_protos_ = new std::vector<std::string>;
@@ -200,6 +212,8 @@ void HttpStreamFactory::SetNextProtos(const std::vector<std::string>& value) {
       enabled_protocols_[NPN_SPDY_3] = true;
     } else if (value[i] == "spdy/3.1") {
       enabled_protocols_[NPN_SPDY_3_1] = true;
+    } else if (value[i] == "spdy/4a1") {
+      enabled_protocols_[NPN_SPDY_4a1] = true;
     } else if (value[i] == "quic") {
       enabled_protocols_[QUIC] = true;
     }