tree 08335d3fa1c096f32796e0f9b97e66e7997de793
parent 4fe4f3d3e9fb2b91ed9695896b872595907e911e
author Sanjay Chouksey <sanjayc@google.com> 1555969512 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1555969512 +0000

[tiler] Add support for min sizes, tabbing and floats.

- Separate files for model classes.
- Utils class includes tree traversal support.
- Tiler constructor needs non-null root.
- Tiler root cannot be a content tile, only row or column
- Adds 'custom' tile type for tabbed tiles.
- Collapses all tiles and their descendants for tabbed tiles
- Removes tile from hierarchy if they don't fit and tabbing
  is not an option.
- Basic support for floating tiles in Tiler widget.
- Improves widget build performance by localizing build
  to the area being changed.

Testing: Includes new and updated unittests.

Change-Id: Idb00d7d346e6d21d077a10fc58577ef9c692b112