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Currently the file_icon_util will return kGoogleGrey700 icons for icons
which do not have a color. In some cases, this is too low contrast to be
easily seen.

A follow up CL will make use of this newly exposed color param to
request theme colors for file icons in the holding space feature.

Bug: 1133913
Change-Id: I8e0f13ce9fb19782de950d7bb8fbe04ca21fb5cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443390Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#812929}