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We are already asserting in tryDeliverTextureFrame() that we are on the SurfaceTextureHelper handler thread, but this behavior isn't guaranteed by Android. Also updated docs for OnTextureFrameAvailableListener, since other classes (e.g. capturers) were also asserting that they were called on the SurfaceTextureHelper thread. Bug: webrtc:8087, b/64609528 Change-Id: I47148c452f66f24477e438b06ef124a96965853d Reviewed-on: https://chromium-review.googlesource.com/610495 Reviewed-by: Sami Kalliomäki <sakal@webrtc.org> Commit-Queue: Jonathan Yu <yujo@chromium.org> Cr-Commit-Position: refs/heads/master@{#19398}