GitLab

1- Modified the mutator logic to maintain the items in a date/section
   ordered hierarchical form
2- The mutator will add views for sections, section separators and
   date separators.

Several other smaller details such as :
1 - First section should have less spacing between the preceding date.
2 - The last date/section shouldn't have a separator.


Bug: 866307
Change-Id: I6eca116c26f403760160d016655fad3c05278c3a
Reviewed-on: https://chromium-review.googlesource.com/1151062
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581045}