Mark webgl2 teximage2d_unpack_params test as flaky on Mac AMD.

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 c90e9c37c88051e5f2a1267ec1a07848be4e9140..5f7b4ddbd2d8fd7472c9439878c9fb71bd9739cb 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -408,6 +408,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         ['mac', 'amd'], bug=663601)
     self.Flaky('deqp/functional/gles3/textureshadow/*',
         ['mac', 'amd'], bug=663601)
+    self.Flaky('deqp/functional/gles3/texturespecification/' +
+        'teximage2d_unpack_params.html',
+        ['mac', 'amd'], bug=679058)
 
     self.Fail('conformance2/rendering/clipping-wide-points.html',
         ['mac', 'amd'], bug=642822)