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Skia's NullGL interface is deprecated, and soon to be removed.
For some unit tests in other modules, the Mock GrContext is a
drop-in replacement.

Here, we end up testing the same path in PaintCanvasVideoRenderer,
but with slightly different behavior inside Skia. Ultimately,
NewSkImageFromVideoFrameNative returns nullptr. Previously, this was
due to the context being abandoned. Now, it fails because the Mock
context doesn't support adopted textures at all. (The new code would
test the same code path even without the abandonContext call).

See also: https://cs.chromium.org/chromium/src/media/renderers/paint_canvas_video_renderer.cc?l=239

Change-Id: Ida0b22c7c60fc5217d5931b79f44a61cc80992b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540357
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644771}