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In the case, the fullscreen strategy is used for scanning out fullscreen
scaled buffers (i.e. fullscreen youtube), instead of single on top strategy.
It makes the case not submit the unnecessary primary plane to display engine.

TEST=Youtube https://youtu.be/w8RN8T13rjE on soraka
BUG=683347

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I8c82c7dd6182c34c0420ff4819ba37d5881039f0
Reviewed-on: https://chromium-review.googlesource.com/656222
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Cr-Commit-Position: refs/heads/master@{#555930}