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it.

As a general rule, doubling the blur values passed in will yield nearly
identical visuals. The main difference is that ShadowValues::GetMargins()
will now return the correct value because of the corrected blur values.
For example, ShadowBorder will now set the correct margins. Previous to
this change, the ShadowBorders in the AppList were clipped because of
the incorrect margins.

BUG=684627,624175
TBR=sadrul@chromium.org

Review-Url: https://codereview.chromium.org/2733363002
Cr-Commit-Position: refs/heads/master@{#455672}