Cherry-pick fix for GrAADistanceFieldPathRenderer bounds to M53.

Cherry-pick fix for GrAADistanceFieldPathRenderer bounds to M53.

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Initialize fGammaCorrect in DF Path Renderer unit test

TBR=jvanverth@google.com
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Review-Url: https://codereview.chromium.org/2157933003

Fix leak when DFPR fails to draw path

TBR=jvanverth@google.com
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Review-Url: https://codereview.chromium.org/2144283002

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
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Review-Url: https://codereview.chromium.org/2144663004
NOTREECHECKS=true
NOTRY=true
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Review-Url: https://codereview.chromium.org/2160563004