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Previously NativeKeycodeToDomCode() would treat codes with a NULL name
for the DomCode (i.e. DomCodes used internally by Chrome to represent
keys with no standardized DOM |code| value.) as unknown.

This has been work-around in the DomCode table by assigning non-NULL
names to non-standard DomCodes, leading to confusion over which are
standardized mappings, and which are Chrome-internal.

Allow native keycodes with no standardized DOM |code| name to be mapped
to their Chrome-internal DomCode value, so that non-standard keys may
be switched to NULL names.

Bug: 952051
Change-Id: I1a08928765e76816410c3b005383b43910be5b51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020928
Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755499}