GitLab

FPS on arm+hires is now ~60fps even with bg blur (w/o notifications)

* Use layer clip during animation
* Remove unnecessary background paint
* Fine tune layer structures: Remove unnecessary texture layer,
  and use smaller layer, or change so that it require less
  repainting.

Refactoring:
* Consolidate the shield/blur/rounded code into TrayBubbleView.
* Introduce layer type to buggle dialog delegate.

Fix:
* Looks like we were painting bg twice which made blur darker.
  It happens once in TrayBubbleView's layer.

Bug: 1033986
Test: no functional change.

Change-Id: I6b31513b04c55c851e468f621b2d18a3183abd56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1963234Reviewed-by: Tim Song <tengs@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724822}