Suppress shaderoperator_common_functions flakes on Mac/NVIDIA.

BUG=702336
TBR=zmo@chromium.org
NOTRY=true

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I8effde179586e867f18773dd363f1ceb96914f97
Reviewed-on: https://chromium-review.googlesource.com/583444
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489094}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -324,6 +324,8 @@ def SetExpectations(self):
         ['mac', 'nvidia', 'intel'], bug=630800)
     self.Fail('deqp/functional/gles3/fbocompleteness.html',
         ['mac', 'nvidia', 'intel'], bug=630800)
+    self.Flaky('deqp/functional/gles3/shaderoperator/common_functions.html',
+        ['mac', 'amd', 'nvidia'], bug=702336)
 
     # Mac Retina NVIDIA
     self.Fail('deqp/functional/gles3/fbomultisample*',
@@ -559,9 +561,6 @@ def SetExpectations(self):
         'random_separate_triangles.html',
         ['mac', 'amd'], bug=483282)
 
-    self.Flaky('deqp/functional/gles3/shaderoperator/common_functions.html',
-        ['mac', 'amd'], bug=702336)
-
     self.Flaky('deqp/functional/gles3/shaderindexing/mat_01.html',
         ['mac', 'amd'], bug=636648)
     self.Flaky('deqp/functional/gles3/shaderindexing/mat_02.html',