Add a whitelist for QUIC hosts.

net/http/http_stream_factory_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/http/http_stream_factory_impl.h"
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
+#include "base/strings/string_util.h"
 #include "net/base/net_util.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_server_properties.h"
 #include "net/http/http_stream_factory_impl_job.h"
 #include "net/http/http_stream_factory_impl_request.h"
+#include "net/http/transport_security_state.h"
 #include "net/log/net_log.h"
 #include "net/net_features.h"
 #include "net/quic/quic_server_id.h"
 #include "net/spdy/spdy_http_stream.h"
 #include "url/gurl.h"
 
 #if BUILDFLAG(ENABLE_BIDIRECTIONAL_STREAM)
 #include "net/spdy/bidirectional_stream_spdy_job.h"
 #endif
 
@@ skipping 253 matching lines @@
 
     // Check whether there's an existing session to use for this QUIC Alt-Svc.
     HostPortPair destination = alternative_service.host_port_pair();
     std::string origin_host =
         ApplyHostMappingRules(request_info.url, &destination).host();
     QuicServerId server_id(destination, request_info.privacy_mode);
     if (session_->quic_stream_factory()->CanUseExistingSession(
             server_id, request_info.privacy_mode, origin_host))
       return alternative_service;
 
+    if (!IsQuicWhitelistedForHost(destination.host()))
+      continue;
+
     // Cache this entry if we don't have a non-broken Alt-Svc yet.
     if (first_alternative_service.protocol == UNINITIALIZED_ALTERNATE_PROTOCOL)
       first_alternative_service = alternative_service;
   }
 
   // Ask delegate to mark QUIC as broken for the origin.
   if (quic_advertised && quic_all_broken && delegate != nullptr)
     delegate->OnQuicBroken();
 
   return first_alternative_service;
@@ skipping 60 matching lines @@
   orphaned_job_set_.erase(job);
   delete job;
 }
 
 void HttpStreamFactoryImpl::OnPreconnectsComplete(const Job* job) {
   preconnect_job_set_.erase(job);
   delete job;
   OnPreconnectsCompleteInternal();
 }
 
+bool HttpStreamFactoryImpl::IsQuicWhitelistedForHost(const std::string& host) {
+  if (session_->params().transport_security_state->IsGooglePinnedHost(host))
+    return true;
+
+  std::string lower_host = base::ToLowerASCII(host);
+  if (ContainsKey(session_->params().quic_host_whitelist, lower_host))
+    return true;
+
+  return base::EndsWith(lower_host, ".snapchat.com",
+                        base::CompareCase::SENSITIVE);
+}
+
 }  // namespace net