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If you ran `gn analyze` on a list of files that changed a build file,
the list of compile targets and output targets should've been returned
unchanged, but if the additional_compile_targets input included "all", the
returned list was left empty.

R=brettw@chromium.org
BUG=648532

Review-Url: https://codereview.chromium.org/2350963006
Cr-Commit-Position: refs/heads/master@{#419866}