Skip two GpuProcess tests on ChromeOS.

GpuProcess_one_extra_workaround and
GpuProcess_disabling_workarounds_works have become flaky there too.

Bug: 1154088
Change-Id: Ic07468cd98aa59dc616a9fdde82b24eb2b6d7c8f
Tbr: rjkroege@chromium.org
Tbr: zmo@chromium.org
No-Try: True
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568638Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832580}

content/test/gpu/gpu_tests/test_expectations/gpu_process_expectations.txt

@@ -61,11 +61,13 @@ crbug.com/257109 [ linux ] GpuProcess_video [ Failure ]
 # Seems to have become flaky on Windows recently.
 crbug.com/700522 [ win ] GpuProcess_one_extra_workaround [ RetryOnFailure ]
 
-# Recently flaking badly on Android and macOS.
+# Recently flaking badly Android, macOS and ChromeOS.
 crbug.com/1154088 [ mac ] GpuProcess_one_extra_workaround [ Skip ]
 crbug.com/1154088 [ android ] GpuProcess_one_extra_workaround [ Skip ]
+crbug.com/1154088 [ chromeos ] GpuProcess_one_extra_workaround [ Skip ]
 crbug.com/1154088 [ mac ] GpuProcess_disabling_workarounds_works [ Skip ]
 crbug.com/1154088 [ android ] GpuProcess_disabling_workarounds_works [ Skip ]
+crbug.com/1154088 [ chromeos ] GpuProcess_disabling_workarounds_works [ Skip ]
 
 crbug.com/1028974 [ linux ] GpuProcess_feature_status_under_swiftshader [ RetryOnFailure ]