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A few method definitions in Skia need to be moved into a new cpp file,
while this define is active the old code will continue to compile until
the Chromium build of Skia can be updated.

NOTRY=true
Adds a define. Built locally, but analyze says "No compile necessary".

Review-Url: https://codereview.chromium.org/2355563002
Cr-Commit-Position: refs/heads/master@{#419506}