Add a QUIC proxy server to the list of QUIC servers supported at start up

components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
index b6b8f379ce37dca3bb79d6e9b0397783a82315e6..72f9c2f76425813ce5effd7baab3485e36ff0eb3 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc
@@ -18,11 +18,14 @@
 #include "net/base/url_util.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
-#include "net/proxy/proxy_server.h"
 #include "net/proxy/proxy_service.h"
 
 namespace data_reduction_proxy {
 
+namespace {
+static const char kDataReductionCoreProxy[] = "proxy.googlezip.net";
+}
+
 DataReductionProxyDelegate::DataReductionProxyDelegate(
     DataReductionProxyConfig* config,
     const DataReductionProxyConfigurator* configurator,
@@ -145,13 +148,36 @@ void DataReductionProxyDelegate::OnAlternativeProxyBroken(
                            1);
 }
 
+net::ProxyServer DataReductionProxyDelegate::GetDefaultAlternativeProxy()
+    const {
+  if (!params::IsZeroRttQuicEnabled())
+    return net::ProxyServer();
+
+  if (alternative_proxies_broken_) {
+    RecordGetDefaultAlternativeProxy(DEFAULT_ALTERNATIVE_PROXY_STATUS_BROKEN);
+    return net::ProxyServer();
+  }
+
+  net::ProxyServer proxy_server(
+      net::ProxyServer::SCHEME_QUIC,
+      net::HostPortPair(kDataReductionCoreProxy, 443));
+  if (!config_ || !config_->IsDataReductionProxy(proxy_server, NULL)) {
+    RecordGetDefaultAlternativeProxy(
+        DEFAULT_ALTERNATIVE_PROXY_STATUS_UNAVAILABLE);
+    return net::ProxyServer();
+  }
+
+  RecordGetDefaultAlternativeProxy(DEFAULT_ALTERNATIVE_PROXY_STATUS_AVAILABLE);
+  return proxy_server;
+}
+
 bool DataReductionProxyDelegate::SupportsQUIC(
     const net::ProxyServer& proxy_server) const {
   // Enable QUIC for whitelisted proxies.
   // TODO(tbansal):  Use client config service to control this whitelist.
   return proxy_server ==
-         net::ProxyServer::FromURI("proxy.googlezip.net:443",
-                                   net::ProxyServer::SCHEME_HTTPS);
+         net::ProxyServer(net::ProxyServer::SCHEME_HTTPS,
+                          net::HostPortPair(kDataReductionCoreProxy, 443));
 }
 
 void DataReductionProxyDelegate::RecordQuicProxyStatus(
@@ -160,6 +186,12 @@ void DataReductionProxyDelegate::RecordQuicProxyStatus(
                             QUIC_PROXY_STATUS_BOUNDARY);
 }
 
+void DataReductionProxyDelegate::RecordGetDefaultAlternativeProxy(
+    DefaultAlternativeProxyStatus status) const {
+  UMA_HISTOGRAM_ENUMERATION("DataReductionProxy.Quic.DefaultAlternativeProxy",
+                            status, DEFAULT_ALTERNATIVE_PROXY_STATUS_BOUNDARY);
+}
+
 void OnResolveProxyHandler(const GURL& url,
                            const std::string& method,
                            const net::ProxyConfig& data_reduction_proxy_config,