Mark flaky WebGL conformance test on Mac Retina

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import os
 
 from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class WebGLConformanceExpectations(GpuTestExpectations):
@@ skipping 359 matching lines @@
         ['mac', ('nvidia', 0xfe9)], bug=635081)
     self.Fail('conformance/programs/' +
         'gl-bind-attrib-location-long-names-test.html',
         ['mac', ('nvidia', 0xfe9)], bug=635081)
     self.Fail('conformance/programs/gl-bind-attrib-location-test.html',
         ['mac', ('nvidia', 0xfe9)], bug=635081)
     self.Fail('conformance/renderbuffers/framebuffer-object-attachment.html',
         ['mac', ('nvidia', 0xfe9)], bug=635081)
     self.Fail('conformance/textures/misc/tex-input-validation.html',
         ['mac', ('nvidia', 0xfe9)], bug=635081)
+    self.Flaky('conformance/uniforms/' +
+        'no-over-optimization-on-uniform-array-12.html',
+        ['mac', ('nvidia', 0xfe9)], bug=684903)
 
     # Mac ASAN only
     self.Fail(
       'conformance/more/functions/copyTexImage2D.html',
       ['mac', 'asan'], bug=681641)
     self.Fail(
       'conformance/more/functions/copyTexSubImage2D.html',
       ['mac', 'asan'], bug=681641)
 
     # Linux failures
@@ skipping 460 matching lines @@
     self.Fail('conformance/textures/misc/texture-npot.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/textures/misc/texture-npot-video.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/textures/misc/texture-size.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/uniforms/gl-uniform-arrays.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Skip('conformance/uniforms/uniform-default-values.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)