Add DataReductionProxy IPC to determine if the Data Reduction Proxy was used.

components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h

Index: components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h
diff --git a/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h b/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h
new file mode 100644
index 0000000000000000000000000000000000000000..52ca776753c7d452f97ba64a2484ff49b30634d1
--- /dev/null
+++ b/components/data_reduction_proxy/content/browser/data_reduction_proxy_message_filter.h
@@ -0,0 +1,43 @@
+// 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_CONTENT_BROWSER_DATA_REDUCTION_PROXY_MESSAGE_FILTER_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_DATA_REDUCTION_PROXY_MESSAGE_FILTER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/browser_message_filter.h"
+
+namespace net {
+class HostPortPair;
+}
+
+namespace data_reduction_proxy {
+
+class DataReductionProxyConfig;
+class DataReductionProxySettings;
+
+class DataReductionProxyMessageFilter

[bengr, 2015/02/26 22:52:52]

Add a class comment and comment for each method.

[jeremyim, 2015/02/27 04:38:40]

Done.

+    : public content::BrowserMessageFilter {
+ public:
+  DataReductionProxyMessageFilter(DataReductionProxySettings* settings);
+
+  void OnWasDataReductionProxyUsed(const net::HostPortPair& proxy_server,

[bengr, 2015/02/26 22:52:52]

This name is awful.

[jeremyim, 2015/02/27 04:38:41]

Done.

+                                   bool* response);
+
+ private:
+  ~DataReductionProxyMessageFilter() override;
+
+  // BrowserMessageFilter implementation.
+  bool OnMessageReceived(const IPC::Message& message) override;
+  void OverrideThreadForMessage(const IPC::Message& message,
+                                content::BrowserThread::ID* thread) override;
+
+  DataReductionProxyConfig* config_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyMessageFilter);
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CONTENT_BROWSER_DATA_REDUCTION_PROXY_MESSAGE_FILTER_H_