Add ClientConfig proto, and JSON generation/parsing.

components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..648cee4ab009cf8a34cddef19823fb09236b8f48
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+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h
@@ -0,0 +1,48 @@
+// 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.
+
+#ifndef COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_
+
+#include <string>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace data_reduction_proxy {
+
+class DataReductionProxyParams;
+class DataReductionProxyRequestOptions;
+
+// Retrieves the Data Reduction Proxy configuration from a remote service. This
+// object lives on the IO thread.
+class DataReductionProxyConfigServiceClient {
+ public:
+  // The caller must ensure that all parameters remain alive for the lifetime of
+  // the |DataReductionProxyConfigClient|.
+  DataReductionProxyConfigServiceClient(
+      DataReductionProxyParams* params,
+      DataReductionProxyRequestOptions* request_options);
+
+  ~DataReductionProxyConfigServiceClient();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(DataReductionProxyConfigClientTest,
+                           TestConstructStaticResponse);
+
+  // Constructs a synthetic response based on |params_|.
+  std::string ConstructStaticResponse() const;
+
+  // The caller must ensure that the |params_| outlives this instance.
+  DataReductionProxyParams* params_;
+
+  // The caller must ensure that the |request_options_| outlives this instance.
+  DataReductionProxyRequestOptions* request_options_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyConfigServiceClient);
+};
+
+}  // namespace data_reduction_proxy
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_CONFIG_SERVICE_CLIENT_H_