Upstream oodles of Chrome for Android code into Chromium.

chrome/browser/android/proto/delta_file.proto

+// 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 definition for a delta file.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package history_report;
+
+message DeltaFileEntry {
+  // Next ID to use: 4
+  optional int64 seq_no = 1;
+  optional string type = 2;
+  optional string url = 3;
+}
+
+message UsageReport {
+  // Next ID to use: 4
+  optional string id = 1;
+  optional int64 timestamp_ms = 2;
+  optional bool typed_visit = 3;
+}