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..55c48efa52bc64c46bea0a65851c8dcecd2989fa 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
@@ -9,6 +9,8 @@
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string_piece.h"
+#include "base/values.h"
+#include "components/data_reduction_proxy/core/common/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"
@@ -386,6 +388,39 @@ bool DataReductionProxyParams::IsDataReductionProxy(
   return false;
 }
 
+void DataReductionProxyParams::PopulateConfigResponse(
+    base::DictionaryValue* response) const {
+  scoped_ptr<base::Value> proxy_config(new base::DictionaryValue());

[bengr, 2015/03/19 16:31:15]

#include "base/memory/scoped_ptr.h"

[jeremyim, 2015/03/20 16:21:12]

Done.

+  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("scheme", GetSchemeString(origin_.scheme()));

[bengr, 2015/03/19 16:31:15]

It might be worthwhile to define constants for "scheme", "host", and "port".

[jeremyim, 2015/03/20 16:21:12]

Done.

+    server->SetString("host", origin_.host_port_pair().host());
+    server->SetInteger("port", origin_.host_port_pair().port());
+    proxy_servers_list->Append(server.release());
+    server.reset(new base::DictionaryValue());
+
+    server->SetString("scheme", GetSchemeString(fallback_origin_.scheme()));
+    server->SetString("host", fallback_origin_.host_port_pair().host());
+    server->SetInteger("port", 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_;