Enable generateMipmap srgb emulation for Linux AMD

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, url_prefixes=None):
     super(WebGL2ConformanceExpectations, self).__init__(
@@ skipping 755 matching lines @@
         ['linux', 'amd'], bug=483282)
     self.Fail('conformance2/reading/read-pixels-pack-parameters.html',
         ['linux', 'amd', 'no_angle'], bug=483282)
     self.Fail('conformance2/textures/misc/tex-unpack-params.html',
         ['linux', 'amd', 'no_angle'], bug=483282)
     self.Fail('conformance2/extensions/ext-color-buffer-float.html',
         ['linux', 'amd'], bug=633022)
     self.Fail('conformance2/rendering/blitframebuffer-filter-outofbounds.html',
         ['linux', 'amd'], bug=655147)
 
-    self.Fail('conformance2/textures/misc/tex-srgb-mipmap.html',
-        ['linux', 'amd'], bug=634519) # WebGL 2.0.1
-
     # Uniform buffer related failures
     self.Fail('deqp/functional/gles3/uniformbuffers/single_struct_array.html',
         ['linux', 'amd'], bug=483282)
     self.Fail('deqp/functional/gles3/uniformbuffers/single_nested_struct.html',
         ['linux', 'amd'], bug=483282)
     self.Fail('deqp/functional/gles3/uniformbuffers/' +
         'single_nested_struct_array.html',
         ['linux', 'amd'], bug=483282)
     self.Fail('deqp/functional/gles3/uniformbuffers/multi_basic_types.html',
         ['linux', 'amd'], bug=483282)
@@ skipping 63 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'])