gpu tests: Suppress failing ext-color-buffer-float test on linux intel.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

 # Copyright (c) 2015 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.
 from gpu_tests.webgl_conformance_expectations import WebGLConformanceExpectations
 
 # See the GpuTestExpectations class for documentation.
 
 class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
   def __init__(self, conformance_path):
     super(WebGL2ConformanceExpectations, self).__init__(conformance_path)
@@ skipping 550 matching lines @@
     self.Fail('conformance2/buffers/bound-buffer-size-change-test.html',
         ['linux', 'nvidia', 'opengl'], bug=483282)
 
     # Linux Intel
     self.Fail('deqp/functional/gles3/shaderderivate_dfdx.html',
         ['linux', 'intel'], bug=618408)
     self.Fail('deqp/functional/gles3/fbomultisample.2_samples.html',
         ['linux', 'intel'], bug=635528)
     self.Fail('deqp/functional/gles3/fbomultisample.4_samples.html',
         ['linux', 'intel'], bug=635528)
+    self.Fail('conformance2/extensions/ext-color-buffer-float.html',
+        ['linux', 'intel'], bug=640389)
 
     # See https://bugs.freedesktop.org/show_bug.cgi?id=94477
     self.Skip('conformance/glsl/bugs/temp-expressions-should-not-crash.html',
         ['linux', 'intel'], bug=540543)  # GPU timeout
 
     # The Mesa Intel driver has a scoping bug, see
     # https://bugs.freedesktop.org/show_bug.cgi?id=95184
     # It has been fixed in Mesa 12.0
     self.Fail('deqp/data/gles3/shaders/scoping.html',
         ['linux', 'intel'], bug=610800)
@@ skipping 314 matching lines @@
     # self.Fail(page_name,
     #     ['linux', ('nvidia', 0x1), 'debug', 'opengl'])
     # self.Fail(page_name,
     #     ['win', ('nvidia', 0x1), 'debug', 'opengl'])
 
     # Conflicts if between a generic os condition and a specific version
     # self.Fail(page_name,
     #     ['xp', ('nvidia', 0x1), 'debug', 'opengl'])
     # self.Fail(page_name,
     #     ['win', ('nvidia', 0x1), 'debug', 'opengl'])