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This change makes flood fill the default ink-drop style. Square InkDrops
are currently bugs in the browser that are kind-of hidden by InkDrop
masks.

It makes use of the same path that FocusRing uses for masks to make sure
that the InkDrop and FocusRing are in sync by default. These mismatch
bugs keep popping up, especially on Mac, as testers verify new parts of
the UI.

Follow-up changes will be to reduce the number of classes that override
CreateInkDrop methods and make sure that they explicitly request a
SquareInkDrop when they want it.

Bug: chromium:888204, chromium:907833, chromium:915284

Change-Id: I681b93d6f5bdfe7f78421ebc8f2fbd522fb6eee4
Reviewed-on: https://chromium-review.googlesource.com/c/1367186
Commit-Queue: Peter Boström <pbos@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Mohsen Izadi <mohsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619533}