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This change updates the approach for writing transfer cache entries into
the transfer buffer from defering the entry until the end of
RasterCHROMIUM to inlining them during the RasterCHROMIUM serialization
itself. It avoid an extra allocation and copy for these entries.

R=enne@chromium.org, ericrk@chromium.org

Bug: 894200
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;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: If12167d36ca074750f114e7af8c715d40a3a7dcc
Reviewed-on: https://chromium-review.googlesource.com/c/1287092
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602626}