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diff --git a/chrome/browser/autocomplete/in_memory_url_index_cache.proto b/chrome/browser/autocomplete/in_memory_url_index_cache.proto
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+++ b/chrome/browser/autocomplete/in_memory_url_index_cache.proto
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+// Copyright (c) 2011 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.
+//
+// InMemoryURLIndex caching protocol buffers.
+//
+// At certain times during browser operation, the indexes from the
+// InMemoryURLIndex are written to a disk-based cache using the
+// following protobuf description.
+
+syntax = "proto2";
+
+option optimize_for = LITE_RUNTIME;
+
+package in_memory_url_index;
+
+message InMemoryURLIndexCacheItem {
+
+  message WordListItem {
+    required uint32 word_count = 1;
+    repeated string word = 2;
+  }
+
+  message WordMapItem {
+    message WordMapEntry {
+      required string word = 1;
+      required int32 word_id = 2;
+    }
+
+    required uint32 item_count = 1;
+    repeated WordMapEntry word_map_entry = 2;
+  }
+
+  message CharWordMapItem {
+    message CharWordMapEntry {
+      required uint32 item_count = 1;
+      required int32 char_16 = 2;
+      repeated int32 word_id = 3 [packed=true];
+    }
+
+    required uint32 item_count = 1;
+    repeated CharWordMapEntry char_word_map_entry = 2;
+  }
+
+  message WordIDHistoryMapItem {
+    message WordIDHistoryMapEntry {
+      required uint32 item_count = 1;
+      required int32 word_id = 2;
+      repeated int64 history_id = 3 [packed=true];
+    }
+
+    required uint32 item_count = 1;
+    repeated WordIDHistoryMapEntry word_id_history_map_entry = 2;
+  }
+
+  message HistoryInfoMapItem {
+    message HistoryInfoMapEntry {
+      message VisitInfo {
+        required int64 visit_time = 1;
+        // Corresponds to ui::PageTransition.
+        required uint64 transition_type = 2;
+      }
+      required int64 history_id = 1;
+      required int32 visit_count = 2;
+      required int32 typed_count = 3;
+      required int64 last_visit = 4;
+      required string url = 5;
+      optional string title = 6;
+      repeated VisitInfo visits = 7;
+    }
+
+    required uint32 item_count = 1;
+    repeated HistoryInfoMapEntry history_info_map_entry = 2;
+  }
+
+  message WordStartsMapItem {
+    message WordStartsMapEntry {
+      required int64 history_id = 1;
+      repeated int32 url_word_starts = 2 [packed=true];
+      repeated int32 title_word_starts = 3 [packed=true];
+    }
+
+    required uint32 item_count = 1;
+    repeated WordStartsMapEntry word_starts_map_entry = 2;
+  }
+
+  // The date that the cache was last rebuilt from history.  Note that
+  // this cache may include items that were visited after this date if
+  // the InMemoryURLIndex was updated on the fly.  This timestamp is meant
+  // to indicate the last date the index was rebuilt from the ground truth:
+  // the history database on disk.
+  required int64 last_rebuild_timestamp = 1;
+  // If there is no version we'll assume version 0.
+  optional int32 version = 2;
+  required int32 history_item_count = 3;
+
+  optional WordListItem word_list = 4;
+  optional WordMapItem word_map = 5;
+  optional CharWordMapItem char_word_map = 6;
+  optional WordIDHistoryMapItem word_id_history_map = 7;
+  optional HistoryInfoMapItem history_info_map = 8;
+  optional WordStartsMapItem word_starts_map = 9;
+}