WebGL CTS: suppress a failure after the move to core profile

BUG=chromium:694877
TBR=zmo@chromium.org
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

Review-Url: https://codereview.chromium.org/2717213003
Cr-Commit-Position: refs/heads/master@{#453314}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -812,6 +812,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('deqp/functional/gles3/shadertexturefunction/' +
         'texelfetchoffset.html',
         ['linux', 'amd'], bug=483282)
+    self.Fail('deqp/functional/gles3/vertexarrays/' +
+        'single_attribute.first.html',
+        ['linux', 'amd'], bug=694877)
 
     self.Fail('deqp/functional/gles3/negativetextureapi.html',
         ['linux', 'amd'], bug=483282)