The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98

commit e8cbd06453b8b4dfc01fa61d004fa0469f42bd98
Author: gangwu <gangwu@chromium.org>
Date: Mon Mar 20 23:24:43 2017

[sync] Add typed url sync metadata to the history db

Two tables of sync metadata, are now being added to the history database.
These two types are the per-entry EntityMetadata and the ModelTypeState,
which is global state for the typed url model type. This change adds a
migration to add the tables, and a new class TypedURLSyncMetadataDatabase
wich would read/write/delete metadatas, with associated tests.

Also a key word "AUTOINCREMENT" is added into urls table's column 'id'
which is primary key. AUTOINCREMENT can avoid to reuse id number when an
url got deleted and then recycled.

BUG= 696701 

Review-Url: https://codereview.chromium.org/2721713002
Cr-Commit-Position: refs/heads/master@{#458232}

[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/BUILD.gn
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/history_database.cc
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/history_database.h
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/in_memory_database.cc
[add] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/typed_url_sync_metadata_database.cc
[add] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/typed_url_sync_metadata_database.h
[add] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/typed_url_sync_metadata_database_unittest.cc
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/url_database.cc
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/url_database.h
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/history/core/browser/url_database_unittest.cc
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/test/data/omnibox/in_memory_url_index_test.db.txt
[modify] https://crrev.com/e8cbd06453b8b4dfc01fa61d004fa0469f42bd98/components/test/data/omnibox/in_memory_url_index_test_limited.db.txt