Added command line flag to override list of proxies from Data Saver API

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 8790a34cd51846272e032bf3ebfd86d50ab00de4..4a128473036b194a8977fed81d3b5e07aa463d47 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
@@ -106,6 +106,12 @@ int GetFieldTrialParameterAsInteger(const std::string& group,
                                     int default_value,
                                     int min_value);
 
+// Returns true if the list of Data Reduction Proxies to use for HTTP requests
+// has been overridden on the command line, and if so, returns the override
+// proxy list in |override_proxies_for_http|.
+bool GetOverrideProxiesForHttpFromCommandLine(
+    std::vector<net::ProxyServer>* override_proxies_for_http);
+
 }  // namespace params
 
 class ClientConfig;
@@ -224,6 +230,9 @@ class DataReductionProxyParams : public DataReductionProxyConfigValues {
 
   bool configured_on_command_line_;
 
+  bool use_override_proxies_for_http_;
+  std::vector<net::ProxyServer> override_proxies_for_http_;
+
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyParams);
 };