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Adding additional parameters to PlaybackImageProvider ctor causes a
regression in total raster time on some mac configs. In order to address
this, break out these settings to a separate struct which can optionally
be given to the provider. The params are modified on the Settings
object post construction.

R=enne@chromium.org

Bug: 768538, 768543
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I0e7fc0df225826e5a26f0f9d09c106a6b2d1f640
Reviewed-on: https://chromium-review.googlesource.com/691206Reviewed-by: enne <enne@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505416}