Suppress more flaky WebGL Vulkan ANGLE tests.

conformance/ogles/GL/struct/struct_001_to_008.html
conformance/ogles/GL/step/step_001_to_006.html
conformance/ogles/GL/sqrt/sqrt_001_to_006.html

Bug: 1017162
Change-Id: I1b633cb37a25539f238d2290ba7aa3a2f783416e
Tbr: kbr@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884601Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710114}

content/test/gpu/gpu_tests/test_expectations/webgl_conformance_expectations.txt

@@ -273,8 +273,11 @@ crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/radians
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/reflect/reflect_001_to_006.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/refract/refract_001_to_006.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/sign/sign_001_to_006.html [ Failure ]
-crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/smoothstep/smoothstep_001_to_006.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/sin/sin_001_to_006.html [ Failure ]
+crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/smoothstep/smoothstep_001_to_006.html [ Failure ]
+crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/sqrt/sqrt_001_to_006.html [ Failure ]
+crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/step/step_001_to_006.html [ Failure ]
+crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/struct/struct_001_to_008.html [ Failure ]
 
 # Vulkan / Win / AMD / Passthrough command decoder
 crbug.com/angleproject/2898 [ win amd vulkan passthrough ] conformance/extensions/oes-texture-float-with-canvas.html [ Failure ]