Upstream Enhanced Bookmark Model (2nd Land)

This is the data layer of enhanced bookmark. There is no reason why
this class should live in private repository.

BUG=428832
Previously landed in:
https://crrev.com/691b64f43fc0a69752344e5edbbc4d8f406cf261
Reverted in: https://crrev.com/f40cb64710a333da6d554e98dfcc432cd6cf8f1f

Review URL: https://codereview.chromium.org/923653002

Cr-Original-Commit-Position: refs/heads/master@{#316085}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ec62d8d37848b12309994f10bf8457ae4fcabb8e

get_landmines.py

@@ -29,6 +29,7 @@ def print_landmines():
     print 'Need to clobber winja goma due to backend cwd cache fix.'
   if platform() == 'android':
     print 'Clobber: to handle new way of suppressing findbugs failures.'
+    print 'Clobber to fix gyp not rename package name (crbug.com/457038)'
   if platform() == 'win' and builder() == 'ninja':
     print 'Compile on cc_unittests fails due to symbols removed in r185063.'
   if platform() == 'linux' and builder() == 'ninja':