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The webkit build invokes the "copypng" command, which is in /usr/bin.

BUG=None

Change-Id: I3a343f5620531665bc6d0f3f7a73c7e84c290912
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2220881Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773295}