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Previously the partial magnifier border was difficult to see on white colored backgrounds. I add a textured layer instead of a solid color, so the border is outlined in black, so that it is visible on all backgrounds.

BUG=638996
TEST=none

https://screenshot.googleplex.com/htWDLX1Bxdp

Committed: https://crrev.com/da331ee46dfead28a5b2af2379f9fad320509957
Review-Url: https://codereview.chromium.org/2269383002
Cr-Original-Commit-Position: refs/heads/master@{#418785}
Cr-Commit-Position: refs/heads/master@{#419199}