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Skia may change a bunch of GL state (including active texture unit) when
we create a backend texture. We can't easily restore that state, so do
a full (often virtual) context switch instead. This will avoid damaging
another client's state.

Bug: 1095679
Change-Id: I511115f8add6c290fc6a63355cfc4b22a7b1b0c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476899
Commit-Queue: Jonathan Backer <backer@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Auto-Submit: Jonathan Backer <backer@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817708}