Mark tex-subimage3d-pixel-buffer-bug as an expected failure on Linux Intel.

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 7dcf1fb463ba20e56ade42fb858868d888e036e7..719c6b1b27fa6639d91fa2b7b9165f9ef0fbf126 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -564,6 +564,10 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
 
     self.Fail('conformance2/textures/misc/tex-mipmap-levels.html',
        ['linux', 'intel'], bug=666384)
+
+    self.Fail('conformance2/textures/misc/tex-subimage3d-pixel-buffer-bug.html',
+       ['linux', 'intel'], bug=662644) # WebGL 2.0.1
+
     self.Fail('deqp/functional/gles3/shadertexturefunction/texturesize.html',
        ['linux', 'intel'], bug=666384)