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Some public headers, like umbrella headers for frameworks, are generated
and so we need a direct dependency path between the copy public headers
target and the target that generates the header.

Change-Id: I14b73804498065c8049a4cea24453b89b759d94c
Reviewed-on: https://chromium-review.googlesource.com/992868
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548010}