Suppress dEQP shaderfunction/texturesize on Mac Pros with AMD GPUs.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
index f53874495562c1d8ff8ccb8af5cc8fa8f30eb508..7c53dbb27981eb7aa003bbd32aae0b513ac27ee9 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -373,6 +373,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('deqp/functional/gles3/transformfeedback/*.html',
         ['mac', 'amd'], bug=483282)
     self.Fail('deqp/functional/gles3/shadertexturefunction/' +
+        'texturesize.html',
+        ['mac', ('amd', 0x679e)], bug=640506)
+    self.Fail('deqp/functional/gles3/shadertexturefunction/' +
         'textureprojlodoffset.html',
         ['mac', 'amd'], bug=483282)
     self.Fail('deqp/functional/gles3/shadertexturefunction/' +