Skip ColorStateTest.* for D3D12 and WARP

These don't pass.

Bug: dawn:489
Change-Id: Ic9a5f34bc3325326d2c6217e82d75633ff0a7534
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/46344
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>

src/tests/end2end/ColorStateTests.cpp

@@ -30,6 +30,10 @@ class ColorStateTest : public DawnTest {
     void SetUp() override {
         DawnTest::SetUp();
 
+        // TODO(crbug.com/dawn/489): D3D12_Microsoft_Basic_Render_Driver_CPU
+        // produces invalid results for these tests.
+        DAWN_SKIP_TEST_IF(IsD3D12() && IsWARP());
+
         vsModule = utils::CreateShaderModule(device, R"(
                 [[builtin(vertex_index)]] var<in> VertexIndex : u32;
                 [[builtin(position)]] var<out> Position : vec4<f32>;