Flatten vulkan-deps.

Sub-repos will be now checked out in third_party directly,
instead of under third_party/vulkan-deps.

Bug: chromium:341002187
Change-Id: I66e9731a478f7416d2e27879b616576209a631f7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/189420
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
diff --git a/third_party/spirv-cross/DIR_METADATA b/third_party/spirv-cross/DIR_METADATA
new file mode 100644
index 0000000..e353adf
--- /dev/null
+++ b/third_party/spirv-cross/DIR_METADATA
@@ -0,0 +1,4 @@
+monorail: {
+  component: "Internals>GPU>Internals"
+}
+team_email: "graphics-dev@chromium.org"