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In blink::LayoutThemeMac, various system color properties are retrieved
from NSColor. These system colors are part of the "dynamic system color
store", and trying to access them may cause issues with the sandbox.

This augments the blink::WebSandboxSuport interface on Mac to look up
system colors via a shared memory segment that is populated by the
browser. In addition, this centralizes the various Mac implementations
of that interface into a single one.

      System Prefs>General and change the Highlight Color. Upon going
      back to Chrome, the new highlight color should be visible.

Bug: 641509, 36032
Test: Highlight some text on a web page. Then go to
Change-Id: I3bc05c08ecab62b1fc68442d3edd93ec7edb8590
Reviewed-on: https://chromium-review.googlesource.com/c/1331133Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609719}