Try to use the vulkan-headers from vulkan-deps instead of third_party/khronos.

Change-Id: Ic4af5ec86e4ea2ec404a6e32e49068fc5993d55a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/85300
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Loko Kung <lokokung@google.com>

scripts/dawn_overrides_with_defaults.gni

@@ -54,6 +54,14 @@ if (!defined(dawn_swiftshader_dir)) {
   dawn_swiftshader_dir = ""
 }
 
+if (!defined(dawn_vulkan_headers_dir)) {
+  dawn_vulkan_headers_dir = "//third_party/vulkan-deps/vulkan-headers/src"
+  if (dawn_standalone) {
+    dawn_vulkan_headers_dir =
+        "${dawn_root}/third_party/vulkan-deps/vulkan-headers/src"
+  }
+}
+
 if (!defined(dawn_vulkan_loader_dir)) {
   # Default to the Vulkan loader not being available except in standalone.
   dawn_vulkan_loader_dir = ""

src/dawn/common/vulkan_platform.h

@@ -155,26 +155,46 @@ namespace dawn::native::vulkan {
 // Import additional parts of Vulkan that are supported on our architecture and preemptively include
 // headers that vulkan.h includes that we have "undefs" for.
 #if defined(DAWN_PLATFORM_WINDOWS)
-#    define VK_USE_PLATFORM_WIN32_KHR
+#    ifndef VK_USE_PLATFORM_WIN32_KHR
+#        define VK_USE_PLATFORM_WIN32_KHR
+#    endif
 #    include "dawn/common/windows_with_undefs.h"
+#else
+#    undef VK_USE_PLATFORM_WIN32_KHR
 #endif  // DAWN_PLATFORM_WINDOWS
 
 #if defined(DAWN_USE_X11)
 #    define VK_USE_PLATFORM_XLIB_KHR
-#    define VK_USE_PLATFORM_XCB_KHR
+#    ifndef VK_USE_PLATFORM_XCB_KHR
+#        define VK_USE_PLATFORM_XCB_KHR
+#    endif
 #    include "dawn/common/xlib_with_undefs.h"
+#else
+#    undef VK_USE_PLATFORM_XCB_KHR
 #endif  // defined(DAWN_USE_X11)
 
 #if defined(DAWN_ENABLE_BACKEND_METAL)
-#    define VK_USE_PLATFORM_METAL_EXT
+#    ifndef VK_USE_PLATFORM_METAL_EXT
+#        define VK_USE_PLATFORM_METAL_EXT
+#    endif
+#else
+#    undef VK_USE_PLATFORM_METAL_EXT
 #endif  // defined(DAWN_ENABLE_BACKEND_METAL)
 
 #if defined(DAWN_PLATFORM_ANDROID)
-#    define VK_USE_PLATFORM_ANDROID_KHR
+#    ifndef VK_USE_PLATFORM_ANDROID_KHR
+#        define VK_USE_PLATFORM_ANDROID_KHR
+#    endif
+#else
+#    undef VK_USE_PLATFORM_ANDROID_KHR
 #endif  // defined(DAWN_PLATFORM_ANDROID)
 
 #if defined(DAWN_PLATFORM_FUCHSIA)
-#    define VK_USE_PLATFORM_FUCHSIA
+#    ifndef VK_USE_PLATFORM_FUCHSIA
+#        define VK_USE_PLATFORM_FUCHSIA
+#    endif
+#else
+#    undef VK_USE_PLATFORM_FUCHSIA
 #endif  // defined(DAWN_PLATFORM_FUCHSIA)
 
 // The actual inclusion of vulkan.h!

src/dawn/native/BUILD.gn

@@ -571,7 +571,7 @@ source_set("sources") {
   }
 
   if (dawn_enable_vulkan) {
-    public_deps += [ "${dawn_root}/third_party/khronos:vulkan_headers" ]
+    public_deps += [ "${dawn_vulkan_headers_dir}:vulkan_headers" ]
     sources += [
       "vulkan/AdapterVk.cpp",
       "vulkan/AdapterVk.h",