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 423 matching lines @@
     self.Fail('deqp/functional/gles3/framebufferblit/rect_03.html',
         ['mac', 'intel'], bug=483282)
     self.Fail('deqp/functional/gles3/framebufferblit/rect_04.html',
         ['mac', 'intel'], bug=483282)
 
     self.Fail('conformance2/textures/misc/tex-unpack-params.html',
         ['mac', 'intel'], bug=483282)
 
     # Linux only.
 
-    self.Skip('conformance2/misc/getextension-while-pbo-bound-stability.html',
-              ['linux'], bug=644572)
     self.Flaky('conformance/textures/video/' +
                'tex-2d-rgba-rgba-unsigned_byte.html',
                ['linux'], bug=627525)
     self.Flaky('conformance/textures/video/' +
                'tex-2d-rgba-rgba-unsigned_short_4_4_4_4.html',
                ['linux'], bug=627525)
     self.Flaky('conformance/textures/video/' +
                'tex-2d-rgba-rgba-unsigned_short_5_5_5_1.html',
                ['linux'], bug=627525)
     self.Flaky('conformance/textures/video/' +
@@ skipping 363 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'])