WebGL: Mark a test flaky on Linux/ANGLE.

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 ef27280601dc5e7cb51fbb95d0af16558f3e4a95..bddecee862e867c53965bcf31cab973b3a3c1f4b 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -468,6 +468,9 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         ['linux', 'opengl'], bug=483282)
     self.Fail('conformance2/reading/read-pixels-pack-parameters.html',
         ['linux', 'opengl'], bug=483282)
+    self.Flaky('deqp/functional/gles3/texturespecification/' +
+        'random_teximage2d_2d.html',
+        ['linux', 'opengl', 'nvidia'], bug=618447)
 
     # Linux Intel
     self.Fail('deqp/functional/gles3/shaderderivate_dfdx.html',