tree 3b24bcd73557537a194311b6bf777464f3e042fb
parent 701bca96ed41fdeab5d2e494e575e638fda657b4
author Kevin Lindkvist <lindkvist@google.com> 1543527714 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1544228476 +0000

[entities] Add the ability to observe story entities

The entity watcher will receive one update with the current value upon
registration.

This also adds an EntityWatcher implementation which is used in the
tests.

MF-92 #done
TESTED=run_modular_tests.sh module_context, story_storage_unittest

Change-Id: Ic9d29172a323c756dd4492df14a659da6d0cf623