Add Data Saver support to Cronet

components/cronet/android/cronet_data_reduction_proxy.h

+// 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_CRONET_ANDROID_CRONET_DATA_REDUCTION_PROXY_H_
+#define COMPONENTS_CRONET_ANDROID_CRONET_DATA_REDUCTION_PROXY_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+
+class PrefService;
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace data_reduction_proxy {
+class DataReductionProxyIOData;
+class DataReductionProxySettings;
+}
+
+namespace net {
+class NetLog;
+class NetworkDelegate;
+class URLRequestContext;
+class URLRequestContextGetter;
+class URLRequestInterceptor;
+}
+
+namespace cronet {
+
+// Wrapper and configurator of Data Reduction Proxy objects for Cronet. It
+// configures the Data Reduction Proxy to run both its UI and IO classes on
+// Cronet's network thread.
+class CronetDataReductionProxy {
+ public:
+  // Construct Data Reduction Proxy Settings and IOData objects and set
+  // the authentication key. The |task_runner| should be suitable for running
+  // tasks on the network thread. The primary proxy, fallback proxy, and secure
+  // proxy check url can override defaults. All or none must be specified.
+  CronetDataReductionProxy(
+      const std::string& key,
+      const std::string& primary_proxy,
+      const std::string& fallback_proxy,
+      const std::string& secure_proxy_check_url,
+      const std::string& user_agent,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      net::NetLog* net_log);
+
+  ~CronetDataReductionProxy();
+
+  // Constructs a network delegate suitable for adding Data Reduction Proxy
+  // request headers.
+  scoped_ptr<net::NetworkDelegate> CreateNetworkDelegate(
+      scoped_ptr<net::NetworkDelegate> wrapped_network_delegate);
+
+  // Constructs a URLRequestInterceptor suitable for carrying out the Data
+  // Reduction Proxy's bypass protocol.
+  scoped_ptr<net::URLRequestInterceptor> CreateInterceptor();
+
+  // Constructs a bridge between the Settings and IOData objects, sets up a
+  // context for secure proxy check requests, and enables the proxy, if
+  // |enable| is true.
+  void Init(bool enable, net::URLRequestContext* context);
+
+ private:
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_ptr<PrefService> prefs_;
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
+  scoped_ptr<data_reduction_proxy::DataReductionProxySettings> settings_;
+  scoped_ptr<data_reduction_proxy::DataReductionProxyIOData> io_data_;
+
+  DISALLOW_COPY_AND_ASSIGN(CronetDataReductionProxy);
+};
+
+}  // namespace cronet
+
+#endif  // COMPONENTS_CRONET_ANDROID_CRONET_DATA_REDUCTION_PROXY_H_