GitLab

Add metadata - remove manually overridden GetClassName.

Add view builders and update view tree construction to use the builder.

TBR=katie@chromium.org

Bug: 772945, 938501, 1130078
Change-Id: Id105b26afb15138ee6e70e7ade5e43be11671a47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2505880Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Auto-Submit: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824581}