Reset PIXEL_UNPACK_BUFFER at texture manager initialization time

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 491 matching lines @@
         ['linux', 'opengl'], bug=483282)
     self.Fail('conformance/textures/webgl_canvas/' +
         'tex-2d-rgb-rgb-unsigned_short_5_6_5.html',
         ['linux', 'opengl'], bug=483282)
     self.Fail('conformance2/textures/misc/tex-unpack-params.html',
         ['linux', 'opengl'], bug=483282)
     self.Fail('conformance2/reading/read-pixels-pack-parameters.html',
         ['linux', 'opengl'], bug=483282)
 
     # Linux NVIDIA only.
-    self.Flaky('conformance2/misc/getextension-while-pbo-bound-stability.html',
-        ['linux', 'nvidia'], bug=483282)
 
     # Linux NVIDIA with ANGLE only
     self.Fail('conformance/attribs/gl-disabled-vertex-attrib.html',
               ['linux', 'nvidia', 'opengl'], bug=483282)
     self.Fail('deqp/functional/gles3/buffercopy.html',
         ['linux', 'nvidia', 'opengl'], bug=483282)
     self.Fail('deqp/functional/gles3/bufferobjectquery.html',
         ['linux', 'nvidia', 'opengl'], bug=483282)
     self.Fail('conformance2/transform_feedback/transform_feedback.html',
         ['linux', 'nvidia', 'opengl'], bug=483282)
@@ skipping 346 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'])