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This is used to synchronously query for available icons matching the
desired parameters. Needed for app_icon_factory.
Will allow other ReadSmallest[Compressed]Icon calls to take a set
purpose and size instead of a vector<IconPurpose> and min_size.

Bug: 1102701
Change-Id: I592db59435badbbd6e63bf6c485b505ad4c86088
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355159
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798563}