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The content box rect was improperly snapped in the local space.
We should snap in the layout space instead, including subpixel
accumulation.

This is a duplicate of trchen@'s old CL
https://codereview.chromium.org/2172503002/ rebased on the current
trunk.

Bug: 627683
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_slimming_paint_v2;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: I737871c4bafead28f1040d486a59f3203c0b0ead
Reviewed-on: https://chromium-review.googlesource.com/c/1271582
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600811}