Fix FNL Werror=maybe-unitialized and skia API changes in FNL build

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index bbd25502ad8df66c6e0a3e8671a31d88ef302c4f..56a43e8b24200148ea3635d8639c543d0a60b52e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -41,7 +41,6 @@ group("default") {
   if (use_ozone) {
     deps += [
       "//ui/ozone",
-      "//ui/ozone/demo",
       "//ui/ozone:ozone_unittests",
     ]
   }
@@ -54,3 +53,12 @@ group("root") {
     ":default",
   ]
 }
+
+if (use_ozone) {
+  # This isn't in the default target as it's a bit wonky right now.
+  group("ozone_demo") {
+    deps = [
+      "//ui/ozone/demo",
+    ]
+  }
+}