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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}