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This CL fixes two things:
(1) We use a solid-color layer to draw hotseat background. However,
Layer::SetBounds() does not mirror bounds under RTL. So we should do
it manually.
(2) View::SetBounds() mirrors bounds under RTL. So mirroring bounds
manually in ShelfView's member function is unnecessary.

Bug: 1094026
Change-Id: Iab5564b6687d7279733e5aa6d37fe41ef28cd15f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261421Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781544}