Command buffer: CopyTexSubImage3D should clear the 3D texture if it is uncleared

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 8c0fbcdd6004b9b3a317e96f28c9182500c032de..e0eca690e671bf95f6df73da6ff4150dce1bc022 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -42,10 +42,6 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
               'invariant-does-not-leak-across-shaders.html',
               bug=634813)
 
-    self.Fail('conformance2/textures/' +
-              'misc/copy-texture-image-webgl-specific.html',
-              bug=631934)
-
     self.Flaky('conformance2/query/occlusion-query.html', bug=603168)
 
     # All platforms with AMD GPU.