[Offline Prefetch] Send GeneratePageBundleRequest to the server

components/offline_pages/core/prefetch/proto/timestamp.proto

Index: components/offline_pages/core/prefetch/proto/timestamp.proto
diff --git a/components/offline_pages/core/prefetch/proto/timestamp.proto b/components/offline_pages/core/prefetch/proto/timestamp.proto
new file mode 100644
index 0000000000000000000000000000000000000000..c9658e73ca0bc8004a234976fbf5c818fae494b9
--- /dev/null
+++ b/components/offline_pages/core/prefetch/proto/timestamp.proto
@@ -0,0 +1,21 @@
+// Copyright 2017 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 = "proto3";
+option optimize_for = LITE_RUNTIME;
+
+package offline_pages.proto;
+
+message Timestamp {
+  // Represents seconds of UTC time since Unix epoch
+  // 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+  // 9999-12-31T23:59:59Z inclusive.
+  int64 seconds = 1;
+
+  // Non-negative fractions of a second at nanosecond resolution. Negative
+  // second values with fractions must still have non-negative nanos values
+  // that count forward in time. Must be from 0 to 999,999,999
+  // inclusive.
+  int32 nanos = 2;
+}