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It affects drawing and hit testing. If the quad is completely outside the clip, nothing is sent to the CPU.
This is going to be used to implement scrolling.
Also, this CL removes the unused copy_rect.

Bug: 839488
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.chromium.linux:linux_vr
Change-Id: I07c087f3d7860456587de092797349851c26502a
Reviewed-on: https://chromium-review.googlesource.com/1054371
Commit-Queue: Aldo Culquicondor <acondor@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558021}