RAPPOR implementation

components/rappor/proto/rappor_metric.proto

Index: components/rappor/proto/rappor_metric.proto
diff --git a/components/rappor/proto/rappor_metric.proto b/components/rappor/proto/rappor_metric.proto
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+// Copyright 2014 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.
+//
+// Contains information collected by the RAPPOR (Randomized Aggregatable
+// Privacy-Preserving Ordinal Responses) system.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package rappor;
+
+message RapporReports {
+  message Report {
+    // The name of the metric, hashed.
+    optional fixed64 name_hash = 1;
+
+    // The sequence of bits produced by random coin flips in
+    // RapporMetric::GetReport().  For a complete description of RAPPOR
+    // metrics, refer to the design document at:
+    // http://www.chromium.org/developers/design-documents/rappor
+    optional bytes bits = 2;
+  }
+  repeated Report report = 1;
+
+  // Which cohort this report belongs to, which varies the hash functions
+  // used in the bloom filter.
+  optional int32 cohort = 2;
+}