Enable QUIC for proxies based on Finch config and command line switch.

components/data_reduction_proxy/core/common/data_reduction_proxy_params.h

Index: components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
diff --git a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
index e8164d7a6f767c5bd7467bbbddfdcaff755e4ccf..8f720a803ffe58f38cc73af20e03dec52464e870 100644
--- a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
+++ b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.h
@@ -99,6 +99,14 @@ class DataReductionProxyParams {
   static bool IsIncludedInAndroidOnePromoFieldTrial(
       const char* build_fingerprint);
 
+  // Returns true if this client is part of a field trial that sets the origin
+  // proxy server as quic://proxy.googlezip.net.
+  static bool IsIncludedInUseQUICFieldTrial();
+
+  // Sets if QUIC is enabled for proxies. Also, may update the origin proxy
+  // server to a QUIC server.
+  void EnableQUIC(bool quic_enabled_for_proxies);
+
   // Constructs configuration parameters. If |kAllowed|, then the standard
   // data reduction proxy configuration is allowed to be used. If
   // |kfallbackAllowed| a fallback proxy can be used if the primary proxy is
@@ -260,6 +268,11 @@ class DataReductionProxyParams {
     return configured_on_command_line_;
   }
 
+  // Returns true if QUIC is enabled for proxies.
+  bool IsQUICEnabled() const {
+    return quic_enabled_for_proxies_;
+  }
+
  protected:
   // Test constructor that optionally won't call Init();
   DataReductionProxyParams(int flags,
@@ -321,6 +334,8 @@ class DataReductionProxyParams {
   bool alt_fallback_allowed_;
   bool promo_allowed_;
   bool holdback_;
+  bool quic_enabled_for_proxies_;
+  std::string command_line_origin_;
 
   bool configured_on_command_line_;
 };