Suppress ...shaders.builtin_variable.fragcoord_w. Suppress dEQP-GLES2.functional.shaders.builtin_variable.fragcoord_w on Android Vulkan. BUG=angleproject:2808 Change-Id: Ib2dcb83bef97352e6a169c0531e2316217d9149e Reviewed-on: https://chromium-review.googlesource.com/1215382 Reviewed-by: Frank Henigman <fjhenigman@chromium.org> Commit-Queue: Frank Henigman <fjhenigman@chromium.org>