gpu: Populate GL path rendering functions in Skia interface
gpu: Populate GL path rendering functions in Skia interface

Populate GL path rendering functions in Skia interface. The
CHROMIUM_path_rendering extension implementation is now complete.

BUG=344330

Review URL: https://codereview.chromium.org/1505133002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#366074}

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