Disable GLHelperPixelReadbackTest.ScalePatching

This test does too much and is flaky on some platforms.

TBR=miu@chromium.org

Bug: 871799
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: If937a1736fcfdca4f004a8f4cf0660bac5f1f794
Reviewed-on: https://chromium-review.googlesource.com/1166283Reviewed-by: Fredrik Hubinette <hubbe@chromium.org>
Commit-Queue: Fredrik Hubinette <hubbe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581410}

components/viz/common/gl_helper_unittest.cc

@@ -1314,7 +1314,7 @@ TEST_P(GLHelperPixelReadbackTest, ScaleTest) {
 }
 
 // FLAKY: https://crbug.com/871799
-TEST_P(GLHelperPixelReadbackTest, FLAKY_ScalePatching) {
+TEST_P(GLHelperPixelReadbackTest, DISABLED_ScalePatching) {
   for (int flipped_source = 0; flipped_source <= 1; ++flipped_source) {
     for (int pattern = 0; pattern < 3; ++pattern) {
       TestScalePatching(