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Add a new pixel test which creates and rasterizes multiple tiles. This
test is meant to check if all tiles are drawn correctly without
overwriting each other contents.

Bug: 883500
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: I83190b6f887122aaf76cfd74533650e732391cdf
Reviewed-on: https://chromium-review.googlesource.com/1222890Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: vikas soni <vikassoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591440}