Add ClientConfig proto, and JSON generation/parsing.

components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc

Index: components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc
diff --git a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc
index 770e3316cf1ddb26fe353e3174b09ec9e3e99bb0..3769f3a3683031c1a9a3f2fb08df16a621f370da 100644
--- a/components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc
+++ b/components/data_reduction_proxy/core/common/data_reduction_proxy_params.cc
@@ -7,8 +7,11 @@
 #include <string>
 
 #include "base/command_line.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_piece.h"
+#include "base/values.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_client_config_parser.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_switches.h"
 #include "net/base/host_port_pair.h"
 #include "net/proxy/proxy_server.h"
@@ -36,6 +39,11 @@ const char kDefaultWarmupUrl[] = "http://www.gstatic.com/generate_204";
 const char kAndroidOneIdentifier[] = "sprout";
 
 const char kQuicFieldTrial[] = "DataReductionProxyUseQuic";
+
+const char kConfigScheme[] = "scheme";
+const char kConfigHost[] = "host";
+const char kConfigPort[] = "port";
+
 }  // namespace
 
 namespace data_reduction_proxy {
@@ -386,6 +394,41 @@ bool DataReductionProxyParams::IsDataReductionProxy(
   return false;
 }
 
+void DataReductionProxyParams::PopulateConfigResponse(
+    base::DictionaryValue* response) const {
+  scoped_ptr<base::Value> proxy_config(new base::DictionaryValue());
+  if (!holdback_) {
+    base::DictionaryValue* proxy_config_dict = nullptr;
+    if (!proxy_config->GetAsDictionary(&proxy_config_dict))
+      return;
+
+    scoped_ptr<base::Value> proxy_servers(new base::ListValue());
+    base::ListValue* proxy_servers_list = nullptr;
+    if (!proxy_servers->GetAsList(&proxy_servers_list))
+      return;
+
+    proxy_servers->GetAsList(&proxy_servers_list);
+    scoped_ptr<base::DictionaryValue> server(new base::DictionaryValue());
+
+    server->SetString(kConfigScheme,
+                      config_parser::GetSchemeString(origin_.scheme()));
+    server->SetString(kConfigHost, origin_.host_port_pair().host());
+    server->SetInteger(kConfigPort, origin_.host_port_pair().port());
+    proxy_servers_list->Append(server.release());
+    server.reset(new base::DictionaryValue());
+
+    server->SetString(kConfigScheme, config_parser::GetSchemeString(
+                                         fallback_origin_.scheme()));
+    server->SetString(kConfigHost, fallback_origin_.host_port_pair().host());
+    server->SetInteger(kConfigPort, fallback_origin_.host_port_pair().port());
+    proxy_servers_list->Append(server.release());
+
+    proxy_config_dict->Set("httpProxyServers", proxy_servers.Pass());
+  }
+
+  response->Set("proxyConfig", proxy_config.Pass());
+}
+
 // Returns the data reduction proxy primary origin.
 const net::ProxyServer& DataReductionProxyParams::origin() const {
   return origin_;