Re-add expected failure of WebGL test get-extension.

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import os
 
 from gpu_tests.gpu_test_expectations import GpuTestExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class WebGLConformanceExpectations(GpuTestExpectations):
@@ skipping 95 matching lines @@
         bug=709484)
 
     self.Fail('conformance/glsl/misc/uninitialized-local-global-variables.html',
         bug=1966) # angle bug ID
 
     # Passthrough command decoder
     self.Fail('conformance/extensions/ext-sRGB.html',
         ['passthrough'], bug=679696)
     self.Fail('conformance/extensions/ext-disjoint-timer-query.html',
         ['passthrough'], bug=1523) # angle bug ID
+    self.Fail('conformance/extensions/get-extension.html',
+        ['passthrough'], bug=682745)
     self.Fail('conformance/extensions/oes-texture-float.html',
         ['passthrough'], bug=1523) # angle bug ID
     self.Fail('conformance/extensions/oes-texture-float-linear.html',
         ['passthrough'], bug=1523) # angle bug ID
     self.Fail('conformance/extensions/oes-texture-half-float.html',
         ['passthrough'], bug=1523) # angle bug ID
     self.Fail('conformance/extensions/oes-texture-half-float-linear.html',
         ['passthrough'], bug=1523) # angle bug ID
     self.Fail('conformance/extensions/webgl-draw-buffers.html',
         ['passthrough'], bug=1523) # angle bug ID
@@ skipping 613 matching lines @@
     self.Fail('conformance/textures/misc/texture-npot.html',
         ['chromeos', ('intel', 0xa011), 'no_passthrough'], bug=375554)
     self.Fail('conformance/textures/misc/texture-npot-video.html',
         ['chromeos', ('intel', 0xa011), 'no_passthrough'], bug=375554)
     self.Fail('conformance/textures/misc/texture-size.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Fail('conformance/uniforms/gl-uniform-arrays.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)
     self.Skip('conformance/uniforms/uniform-default-values.html',
         ['chromeos', ('intel', 0xa011)], bug=375554)