Update WebGL conformance test expectations for Android.

BUG=
TEST=android_optional_gpu_bot
TBR=jmadill@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=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/2176993002
Cr-Commit-Position: refs/heads/master@{#407351}

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

@@ -726,6 +726,8 @@ class WebGLConformanceExpectations(GpuTestExpectations):
         ['linux', 'debug', ('intel', 0x412)], bug=604140)
 
     # Android failures
+    self.Fail('conformance/glsl/bugs/sequence-operator-evaluation-order.html',
+        ['android'], bug=478572)
     self.Fail('deqp/data/gles2/shaders/constants.html',
         ['android'], bug=478572)
     self.Fail('deqp/data/gles2/shaders/conversions.html',