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To avoid decreasing the supported platforms from today, this expands
enable_hidpi from Linux (incl. CrOS)/Mac/Win to also include iOS.

Bug: 564112
Change-Id: I246ea0dd25d93a174195489c2e388e3c7a890e8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670357
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672639}