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This reverts commit dcfaac01.

Reason for revert: Regressed canvas 2d performance in some MotionMark
tests. Will redo as a WebGL-specific change.

Original change's description:
> GPU: Remove transfer buffer autoflushing.
> 
> This is change #2 of 3 reducing context switching during WebGL
> rendering. On tiled rendering GPUs context switches are slow and can
> even cause multisampling artifacts. Every time the command buffer is
> flushed, a context switch is possible.
> 
> Before, the transfer buffer would flush the command buffer after an
> arbitrary number of bytes were sent. This change removes that threshold.
> Any performance benefit of early flushing is killed by the additional
> context switching.
> 
> Bug: 828363,835353
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I8f71668d4b976332820d290868282d41286ab4fe
> Reviewed-on: https://chromium-review.googlesource.com/1077568
> Commit-Queue: James Darpinian <jdarpinian@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#563404}

TBR=piman@chromium.org,jdarpinian@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 828363, 835353, 849348
Change-Id: Iba27bae33f5395333f54db4bea4e79e41cca7e31
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1087370
Commit-Queue: James Darpinian <jdarpinian@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565006}