wayland-protocols: Add protocol for explicit synchronization support.

third_party/wayland-protocols/BUILD.gn

Index: third_party/wayland-protocols/BUILD.gn
diff --git a/third_party/wayland-protocols/BUILD.gn b/third_party/wayland-protocols/BUILD.gn
index 84c81563f25647be4ecc68a73a1ddb9454de1e37..e00527464dfc511430e25c37dd6efbaba740f2cf 100644
--- a/third_party/wayland-protocols/BUILD.gn
+++ b/third_party/wayland-protocols/BUILD.gn
@@ -190,3 +190,24 @@ source_set("stylus_protocol") {
 
   public_configs = [ ":stylus_protocol_config" ]
 }
+
+config("linux_explicit_synchronization_protocol_config") {
+  include_dirs = [ "include/protocol" ]
+}
+
+source_set("linux_explicit_synchronization_protocol") {
+  sources = [
+    "include/protocol/linux-explicit-synchronization-unstable-v1-client-protocol.h",
+    "include/protocol/linux-explicit-synchronization-unstable-v1-server-protocol.h",
+    "protocol/linux-explicit-synchronization-protocol.c",
+  ]
+
+  deps = [
+    "//third_party/wayland:wayland_util",
+  ]
+
+  configs -= [ "//build/config/compiler:chromium_code" ]
+  configs += [ "//build/config/compiler:no_chromium_code" ]
+
+  public_configs = [ ":linux_explicit_synchronization_protocol_config" ]
+}