WebGL2 CTS: Mark interleaved XFB flaky on Win GL NVIDIA

TBR=kbr@chromium.org
BUG=822733

Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I8d8b0b6c411b8974b130e40776591897cd41760e
Reviewed-on: https://chromium-review.googlesource.com/966884Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543793}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -226,6 +226,16 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         'blitframebuffer-srgb-and-linear-drawbuffers.html',
         ['win', 'nvidia', 'opengl'], bug=2355) # ANGLE bug ID
 
+    self.Flaky('deqp/functional/gles3/transformfeedback/' +
+        'basic_types_interleaved_points.html',
+        ['win', ('nvidia', 0x1cb3), 'opengl'], bug=822733)
+    self.Flaky('deqp/functional/gles3/transformfeedback/' +
+        'basic_types_interleaved_lines.html',
+        ['win', ('nvidia', 0x1cb3), 'opengl'], bug=822733)
+    self.Flaky('deqp/functional/gles3/transformfeedback/' +
+        'basic_types_interleaved_triangles.html',
+        ['win', ('nvidia', 0x1cb3), 'opengl'], bug=822733)
+
     # Win / AMD
     self.Fail('conformance2/rendering/blitframebuffer-stencil-only.html',
         ['win', 'amd', 'd3d11'], bug=483282) # owner:jmadill