gpu: Supress WebGL depth-renderbuffer-initialization test on Win NVIDIA Vulkan

This test is flaky, most likely because initialization is not occuring.

TBR=ynovikov@chromium.org
NOTRY=true
BUG=1017162

Change-Id: I252aed96b39a7dba2e71257090e48f10d7a1bce4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1944281Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720488}

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

@@ -269,6 +269,7 @@ crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/ogles/GL/* [ Fai
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/context/context-attribute-preserve-drawing-buffer.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/extensions/oes-fbo-render-mipmap.html [ Failure ]
 crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/renderbuffers/stencil-renderbuffer-initialization.html [ Failure ]
+crbug.com/1017162 [ win nvidia vulkan passthrough ] conformance/renderbuffers/depth-renderbuffer-initialization.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 ]