Report Precache.TimeSinceLastPrecache

components/precache/core/proto/timestamp.proto

Index: components/precache/core/proto/timestamp.proto
diff --git a/components/precache/core/proto/timestamp.proto b/components/precache/core/proto/timestamp.proto
new file mode 100644
index 0000000000000000000000000000000000000000..7d7efaf3e9c4cf7fe6fa194a469c8e2dec46302e
--- /dev/null
+++ b/components/precache/core/proto/timestamp.proto
@@ -0,0 +1,17 @@
+// 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.
+
+syntax = "proto2";
+
+package precache;
+
+// Chrome requires this.
+option optimize_for = LITE_RUNTIME;
+
+message Timestamp {
+  // Represents seconds of UTC time since Unix epoch
+  // 1970-01-01T00:00:00Z. Must be from from 0001-01-01T00:00:00Z to
+  // 9999-12-31T23:59:59Z inclusive.
+  optional int64 seconds = 1;
+}