Add ClientConfig proto, and JSON generation/parsing.

components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..77d122a99b8efc6595d092978117435b754e0c43
--- /dev/null
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.cc
@@ -0,0 +1,37 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config_client.h"
+
+#include "base/json/json_writer.h"
+#include "base/logging.h"
+#include "base/values.h"
+#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_request_options.h"
+#include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
+
+namespace data_reduction_proxy {
+
+DataReductionProxyConfigClient::DataReductionProxyConfigClient(
+    DataReductionProxyParams* params,
+    DataReductionProxyRequestOptions* request_options)
+    : params_(params),
+      request_options_(request_options) {
+  DCHECK(params);
+  DCHECK(request_options);
+}
+
+DataReductionProxyConfigClient::~DataReductionProxyConfigClient() {
+}
+
+std::string DataReductionProxyConfigClient::ConstructStaticResponse() {

[bengr, 2015/03/19 16:31:14]

Can this method be const?

[jeremyim, 2015/03/20 16:21:10]

Done.

+  std::string response;
+  scoped_ptr<base::DictionaryValue> values(new base::DictionaryValue());
+  params_->PopulateConfigResponse(values.get());
+  request_options_->PopulateConfigResponse(values.get());
+  base::JSONWriter::Write(values.get(), &response);
+

[bengr, 2015/03/19 16:31:14]

Remove blank line.

[jeremyim, 2015/03/20 16:21:10]

Done.

+  return response;
+}
+
+}  // namespace data_reduction_proxy