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This is especially needed because ui/gfx headers, in turn, can include skia headers,
which are only meaningful in the context of skia's compile flags. Those are available
from ui/gfx since it re-exports skia's dependencies.

Landing tbr to unblock skia's DEPS roll.
TBR=lambros@chromium.org

Review URL: https://codereview.chromium.org/341633002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277926 0039d316-1c4b-4281-b951-d872f2087c98