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Public typemaps may use non-wtf types, since they are consumed by embedder.
Generating blink variant for them fails. One example would be a manifest
typemap which currently resides in content, but will be moved to blink.

Those typemaps which can be used inside blink (and are used already)
are added to blink_typemaps instead. These are usually enum typemaps
and can be shared verbatim between variants.

Bug: none
Change-Id: Ifd969c6de92e6e0507b40b2426e0b33119ea599b
Reviewed-on: https://chromium-review.googlesource.com/1015228Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552844}