Adding DRP specfic UMA for FirstContentfulPaint

components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h
new file mode 100644
index 0000000000000000000000000000000000000000..5357a36b3401a42edfc1fe6a3e4565fdd06678c9
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+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h
@@ -0,0 +1,28 @@
+// Copyright 2016 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_DATA_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_DATA_H_
+
+#include "base/macros.h"
+#include "base/supports_user_data.h"
+
+namespace data_reduction_proxy {
+
+extern const void* const kDataReductionProxyUserDataKey;
+
+class DataReductionProxyData : public base::SupportsUserData::Data {
+ public:
+  DataReductionProxyData(bool used_data_reduction_proxy);
+  bool get_used_data_reduction_proxy();
+
+ private:
+  bool used_data_reduction_proxy_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyData);
+};
+
+}  // namespace data_reduction_proxy
+
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_CORE_BROWSER_DATA_REDUCTION_PROXY_DATA_H_