third_party: Add wayland_drm_protocol target to third_party/mesa.

third_party/mesa/BUILD.gn

Index: third_party/mesa/BUILD.gn
diff --git a/third_party/mesa/BUILD.gn b/third_party/mesa/BUILD.gn
index 5ea0f305de7b4d2ae9cb585789fe3ffe0d3a4eac..73be8e665038686ab14cc3a31b43834cec4023ab 100644
--- a/third_party/mesa/BUILD.gn
+++ b/third_party/mesa/BUILD.gn
@@ -717,8 +717,8 @@ if (!is_android) {  # TODO(GYP) enable for Android.
     }
 
     deps = [
-      ":mesa_headers",
       ":mesa",
+      ":mesa_headers",
       ":mesa_libglslcommon",
       "//build/config/sanitizers:deps",
     ]
@@ -736,4 +736,28 @@ if (!is_android) {  # TODO(GYP) enable for Android.
   group("osmesa") {
   }
 }  # !is_android
+
 # TODO(GYP) Android osmesa_in_lib_dir target.
+
+if (is_linux) {
+  config("wayland_drm_protocol_config") {
+    include_dirs = [ "$generated_src_dir/egl/wayland/wayland-drm" ]
+  }
+
+  source_set("wayland_drm_protocol") {
+    sources = [
+      "$generated_src_dir/egl/wayland/wayland-drm/wayland-drm-client-protocol.h",
+      "$generated_src_dir/egl/wayland/wayland-drm/wayland-drm-protocol.c",
+      "$generated_src_dir/egl/wayland/wayland-drm/wayland-drm-server-protocol.h",
+    ]
+
+    deps = [
+      "//third_party/wayland:wayland_util",
+    ]
+
+    configs -= [ "//build/config/compiler:chromium_code" ]
+    configs += [ "//build/config/compiler:no_chromium_code" ]
+
+    public_configs = [ ":wayland_drm_protocol_config" ]
+  }
+}