gpu tests: Speculative fix for screenshot test.

Reduce the number of repititions to avoid a timeout in the test.

BUG=853762

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: I08f70316da5c28d92ccb142e71ecd6c903bca612
Reviewed-on: https://chromium-review.googlesource.com/1105063Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568296}

content/test/gpu/gpu_tests/screenshot_sync_expectations.py

@@ -21,6 +21,3 @@ class ScreenshotSyncExpectations(GpuTestExpectations):
                bug=639489)
     # TODO(kbr): flakily timing out on this configuration.
     self.Flaky('*', ['linux', 'intel', 'debug'], bug=648369)
-    # This is only flaky on the Viz config. Unsure how to filter for viz.
-    self.Flaky('ScreenshotSync_GPURasterWithCanvas', ['win', 'intel'],
-               bug=853762)

content/test/gpu/gpu_tests/screenshot_sync_integration_test.py

@@ -131,7 +131,7 @@ class ScreenshotSyncIntegrationTest(gpu_integration_test.GpuIntegrationTest):
     browser_arg = args[0]
     self.RestartBrowserIfNecessaryWithArgs(self._AddDefaultArgs([browser_arg]))
     self._Navigate(test_path)
-    repetitions = 20
+    repetitions = 10
     for _ in range(0, repetitions):
       self._CheckScreenshot()