Mark conformance2/textures/canvas_sub_rectangle/* flaky on Linux NVIDIA.

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, is_asan=False):
     super(WebGL2ConformanceExpectations, self).__init__(
@@ skipping 701 matching lines @@
         'random_teximage2d_2d.html',
         ['linux', 'amd', 'intel'], bug=618447)
     self.Fail('conformance2/rendering/clipping-wide-points.html',
         ['linux', 'amd', 'intel'], bug=662644) # WebGL 2.0.1
 
     # Linux NVIDIA
     # Explicitly specifying GT 610 to avoid conflict with Quadro P400 rule
     self.Flaky('deqp/functional/gles3/multisample.html',
         ['linux', ('nvidia', 0x104a)], bug=714207)
 
+    # Any of these tests become flaky if they follow
+    # conformance2/samplers/samplers.html and if virtualized GL
+    # contexts are being used.
+    self.Flaky('conformance2/textures/canvas_sub_rectangle/*',
+        ['linux', 'nvidia'], bug=694359)
+
     # This test is flaky both with and without ANGLE.
     self.Flaky('deqp/functional/gles3/texturespecification/' +
         'random_teximage2d_2d.html',
         ['linux', 'nvidia'], bug=618447)
     self.Fail('conformance/glsl/bugs/unary-minus-operator-float-bug.html',
         ['linux', 'nvidia'], bug=672380)
     self.Fail('conformance2/glsl3/vector-dynamic-indexing-swizzled-lvalue.html',
         ['linux', 'nvidia'], bug=709351)
     self.Fail('conformance2/textures/image_bitmap_from_canvas/' +
         'tex-3d-srgb8_alpha8-rgba-unsigned_byte.html',
@@ skipping 418 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'])