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PaintCanvasVideoRenderer::CopyVideoFrameTexturesToGLTexture
unnecessarily used verified sync tokens to pass textures between
Skia's context and WebGL's context. Verification isn't needed
because these two clients are being used synchronously from the
same process and thread.

Changing these sync tokens to be unverified gives us a nice
speedup - on a simple mp4-to-WebGL case on Linux, the texImage2D
blocking time drops from ~1.25 ms to ~0.70ms (~80% speedup).

Bug: 871417
Change-Id: I38c246fdb49588eccc87211fa06a2abf00e55c5c
Reviewed-on: https://chromium-review.googlesource.com/1164163Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584840}