Add Data Saver support to Cronet

components/cronet/android/cronet_data_reduction_proxy.h

Index: components/cronet/android/cronet_data_reduction_proxy.h
diff --git a/components/cronet/android/cronet_data_reduction_proxy.h b/components/cronet/android/cronet_data_reduction_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..247fd5eb9ef44d8fb691bf75088b86bc94b616c9
--- /dev/null
+++ b/components/cronet/android/cronet_data_reduction_proxy.h
@@ -0,0 +1,75 @@
+// 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.

[mmenke, 2015/03/13 18:16:47]

nit:  Cronet

[bengr, 2015/03/19 01:03:51]

Done.

+class CronetDataReductionProxy {

[mmenke, 2015/03/13 18:16:47]

Do we need the proxy delegate?

[bengr, 2015/03/19 01:03:51]

No. That was used only for DRP CONNECT support. There's a goal of eventually
moving more to that delegate but not yet.

+ public:
+  // Construct Data Reduction Proxy Settings and IOData objects and set
+  // the authentication key.
+  CronetDataReductionProxy(
+      const std::string& key,
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,

[mmenke, 2015/03/13 18:16:47]

Should make it clear what the requirements for the task_runner are.

[bengr, 2015/03/19 01:03:50]

Done.

+      net::NetLog* net_log);
+
+  virtual ~CronetDataReductionProxy();

[mmenke, 2015/03/13 18:16:47]

Virtual not needed.

[bengr, 2015/03/19 01:03:51]

Done.

+
+  // Constructs a network delegate suitable for adding Data Reduction Proxy
+  // request headers.
+  net::NetworkDelegate* CreateNetworkDelegate(

[mmenke, 2015/03/13 18:16:47]

Should return a scoped_ptr<NetworkDelegate>

[bengr, 2015/03/19 01:03:51]

Done.

+      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:
+  static scoped_ptr<PrefService> CreatePrefService();

[mmenke, 2015/03/13 18:16:47]

This isn't needed in the header - can just be in an anonymous namespace in the
CC file, since it doesn't need access to any of this class's private members.

[bengr, 2015/03/19 01:03:51]

Done.

+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  scoped_ptr<PrefService> prefs_;
+  scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;

[mmenke, 2015/03/13 18:16:47]

I don't think we need to hold on to this.

[bengr, 2015/03/19 01:03:51]

Someone does, and currently DRPService takes a raw pointer.

[mmenke, 2015/03/19 02:50:18]

That should be fixed.  Happy to review a tiny CL that does that.

[bengr, 2015/03/19 17:56:24]

This can't be fixed easily afaik. In profile_impl_io_data.cc,
InitDataReductionProxySettings gets a raw pointer to the request context getter
from the profile. See:
https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/pro...

+  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_