Mark flaky passthrough CB WebGL conformance test on Win10

content/test/gpu/gpu_tests/webgl_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
index 3a069ffe7a95fc14b7ddde251b5ebebf70c9d9dd..fcb04348eafd170b881c1c72196de4d257f58502 100644
--- a/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl_conformance_expectations.py
@@ -352,6 +352,8 @@ class WebGLConformanceExpectations(GpuTestExpectations):
     self.Fail('conformance/textures/misc/' +
         'copytexsubimage2d-large-partial-copy-corruption.html',
         ['win', 'intel', 'passthrough', 'd3d11'], bug=602688)
+    self.Flaky('conformance/textures/misc/copytexsubimage2d-subrects.html',
+        ['win10', 'intel', 'passthrough', 'd3d11'], bug=685232)
 
     # Mac failures
     self.Flaky('conformance/extensions/oes-texture-float-with-video.html',