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This removes placeholder colors and opacities, instead allowing the
user to configure them. ToolbarButton configures its
InstallableInkDrop to match its classic InkDrops as closely as
possible.

Bug: 933384
Change-Id: I3d328e0218793589f829a9187359c4ed21d780b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713865
Auto-Submit: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680494}