ozone: ClientPixmapManager passes VGEM fd from browser to renderer.

content/child/BUILD.gn

Index: content/child/BUILD.gn
diff --git a/content/child/BUILD.gn b/content/child/BUILD.gn
index 9698873cd331c569878c38350271b66960d5a49c..e9952a8398eaedf47054557b55cd0e49505d6d1f 100644
--- a/content/child/BUILD.gn
+++ b/content/child/BUILD.gn
@@ -134,4 +134,13 @@ source_set("child") {
   if (is_win || !use_aura) {
     sources -= [ "npapi/webplugin_delegate_impl_aura.cc" ]
   }
+
+  if (!use_ozone) {
+    sources -= [
+      "child_client_native_pixmap_factory_message_filter_ozone.cc",
+      "child_client_native_pixmap_factory_message_filter_ozone.h",
+      "child_client_native_pixmap_factory_ozone.cc",
+      "child_client_native_pixmap_factory_ozone.h",
+    ]
+  }
 }