swapchain: Implement VK_GOOGLE_surfaceless_query

This extension allows ANGLE to call Vulkan WSI queries before it has a
VkSurfaceKHR.

This version tries to address some subtle differences between upstream
and downstream branches.

Bug: 203826952
Test: Test with ANGLE EGLConfig-generation code
Change-Id: I7eb013efbaa5dd19ebed045583616238cea57023
diff --git a/vulkan/scripts/driver_generator.py b/vulkan/scripts/driver_generator.py
index 6a73023..cd25dd8 100644
--- a/vulkan/scripts/driver_generator.py
+++ b/vulkan/scripts/driver_generator.py
@@ -27,6 +27,7 @@
     'VK_EXT_hdr_metadata',
     'VK_EXT_swapchain_colorspace',
     'VK_GOOGLE_display_timing',
+    'VK_GOOGLE_surfaceless_query',
     'VK_KHR_android_surface',
     'VK_KHR_get_surface_capabilities2',
     'VK_KHR_incremental_present',