Suppress failing vulkan_swift_shader_blink_web_test case

Suppress compositing/reflections/reflection-on-composited.html

TBR=backer@chromium.org

Test: vulkan_swift_shader_blink_web_tests
Bug: 979652
Change-Id: I862e5fd53e2ce63096287c9e26713a5002d0c635
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681877
Reviewed-by: Jonathan Ross <jonross@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#673363}

third_party/blink/web_tests/FlagExpectations/use-vulkan=swiftshader

@@ -205,3 +205,6 @@ crbug.com/977289 css3/filters/blur-filter-page-scroll-self.html [ Skip ]
 crbug.com/977289 css3/filters/effect-reference-add-hw.html [ Skip ]
 crbug.com/977289 css3/filters/effect-reference-source-alpha-hw.html [ Skip ]
 crbug.com/977289 css3/filters/effect-reference-subregion-hidpi-hw.html [ Skip ]
+
+# Color issue in Reflection test
+crbug.com/979652 compositing/reflections/reflection-on-composited.html [ Skip ]