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.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h
index 7d8b1b55e4cee3d456978e1395ee1d312b6cf845..e65a9a5caac21ea35e64a38db29b57c69b6892db 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "net/base/proxy_delegate.h"
 #include "net/proxy/proxy_retry_info.h"
+#include "net/proxy/proxy_server.h"
 #include "url/gurl.h"
 
 namespace net {
@@ -19,7 +20,6 @@ class HttpResponseHeaders;
 class NetLog;
 class ProxyConfig;
 class ProxyInfo;
-class ProxyServer;
 class ProxyService;
 class URLRequest;
 }
@@ -71,6 +71,7 @@ class DataReductionProxyDelegate : public net::ProxyDelegate {
       net::ProxyServer* alternative_proxy_server) const override;
   void OnAlternativeProxyBroken(
       const net::ProxyServer& alternative_proxy_server) override;
+  net::ProxyServer GetDefaultAlternativeProxy() const override;
 
   // Protected so that it can be overridden during testing.
   // Returns true if |proxy_server| supports QUIC.
@@ -85,10 +86,24 @@ class DataReductionProxyDelegate : public net::ProxyDelegate {
     QUIC_PROXY_STATUS_BOUNDARY
   };
 
+  // Availability status of data reduction proxy that supports 0-RTT QUIC.
+  // Protected so that the enum values are accessible for testing.
+  enum DefaultAlternativeProxyStatus {
+    DEFAULT_ALTERNATIVE_PROXY_STATUS_AVAILABLE,
+    DEFAULT_ALTERNATIVE_PROXY_STATUS_BROKEN,
+    DEFAULT_ALTERNATIVE_PROXY_STATUS_UNAVAILABLE,
+    DEFAULT_ALTERNATIVE_PROXY_STATUS_BOUNDARY,
+  };
+
  private:
   // Records the availability status of data reduction proxy.
   void RecordQuicProxyStatus(QuicProxyStatus status) const;
 
+  // Records the availability status of data reduction proxy that supports 0-RTT
+  // QUIC.
+  void RecordGetDefaultAlternativeProxy(
+      DefaultAlternativeProxyStatus status) const;
+
   const DataReductionProxyConfig* config_;
   const DataReductionProxyConfigurator* configurator_;
   DataReductionProxyEventCreator* event_creator_;