LevelDB storage for data reduction proxy to store data usage stats.

components/data_reduction_proxy/proto/data_store.proto

Index: components/data_reduction_proxy/proto/data_store.proto
diff --git a/components/data_reduction_proxy/proto/data_store.proto b/components/data_reduction_proxy/proto/data_store.proto
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+// 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.
+//
+// Protocol buffer definitions for Data Reduction Proxy data stored in LevelDB.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package data_reduction_proxy;
+
+// Contains data usage for an interval of time.
+message DataUsageBucket {
+  repeated PerSiteDataUsage site_usage = 1;
+  optional int64 last_updated_timestamp = 2;
+}
+
+// Data usage for a specific site.
+message PerSiteDataUsage {
+  required string site_url = 1;
+  required int64 original_content_length = 2;
+  required int64 content_length = 3;
+}