Make GrBatchAtlas robust against attempts to add large rects.

Make GrAADistanceFieldPathRenderer robust against paths that in src space wind up being too large for the atlas.

BUG=chromium:627443
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2144663004

Review-Url: https://codereview.chromium.org/2144663004
4 files changed