[PointerCapture] Generate headers for wayland relative-pointer extension

Generated headers for the wayland extension
relative-pointer-unstable-v1 to add pointer capture support.

Bug: b/121287287
Change-Id: Ia9e69480a5940138462bf856d6db454f64872fff
Reviewed-on: https://chromium-review.googlesource.com/c/1388724
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Prabir Pradhan <prabirmsp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623529}
diff --git a/third_party/wayland-protocols/BUILD.gn b/third_party/wayland-protocols/BUILD.gn
index 463e0b1..b72da6c 100644
--- a/third_party/wayland-protocols/BUILD.gn
+++ b/third_party/wayland-protocols/BUILD.gn
@@ -72,6 +72,12 @@
   ]
 }
 
+wayland_protocol("relative_pointer_protocol") {
+  sources = [
+    "src/unstable/relative-pointer/relative-pointer-unstable-v1.xml",
+  ]
+}
+
 wayland_protocol("keyboard_configuration_protocol") {
   sources = [
     "unstable/keyboard/keyboard-configuration-unstable-v1.xml",