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The color here is not a real SkColor, use uint32_t instead.
This is a follow up for(Brian Salomon comments):
https://chromium-review.googlesource.com/c/chromium/src/+/1068649

BUG=821176

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: I69adc5cebffee772634186fc8d9438de8e3e8523
Reviewed-on: https://chromium-review.googlesource.com/1074831Reviewed-by: Brian Salomon <bsalomon@chromium.org>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Commit-Queue: Xing Xu <xing.xu@intel.com>
Cr-Commit-Position: refs/heads/master@{#563114}