Use the canvas-based SkPaintFilterCanvas ctor in OpacityFilterCanvas
Use the canvas-based SkPaintFilterCanvas ctor in OpacityFilterCanvas

Using the new constructor ensures that the proxy canvas is correctly
initialized with the target canvas state.

BUG=516790
R=reed@google.com,robertphillips@google.com

Review URL: https://codereview.chromium.org/1287203004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#343832}

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