GitLab

A LocalSurfaceId allocation/renewal for an aura::Window happens in
response to a bounds or dsf-change to its corresponding ui::Layer.
The root window is special in this regard, since its state can be
changed only by the WindowTreeHost, and should happen before the
ui::Compositor is updated for the new bounds/dsf (since it needs
to provide the LocalSurfaceId to the ui::Compositor).

Window::SetDeviceScaleFactor() is no longer needed after this. So
remove that.

BUG=821987

Change-Id: I3eb674b1c59a2728315125b6eb14b610033f6bf4
Reviewed-on: https://chromium-review.googlesource.com/1012932Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551180}