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Automatically growing transfer buffer removed the flush when it would
run of space.  This decreased canvas throughput by reducing pipelining.

Automatic flushes are another way of improving throughput by submitting
work to the GPU process often.  This CL enables automatic flushes for
the shared main thread context used for canvas which might have been
disabled unintentionally.

Bug: 880901
Change-Id: Ib48d9c56c18c9e2d449d7c42f74b16609ad3ea55
Reviewed-on: https://chromium-review.googlesource.com/1213665Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589688}