DNR Prototype: With flatbuffers

extensions/browser/guest_view/BUILD.gn

Index: extensions/browser/guest_view/BUILD.gn
diff --git a/extensions/browser/guest_view/BUILD.gn b/extensions/browser/guest_view/BUILD.gn
index 2b81c0d143678a918eb8f09440af57d76c3bac84..5d8c6a8ecd3a0973b8ff593164c12a6719f74963 100644
--- a/extensions/browser/guest_view/BUILD.gn
+++ b/extensions/browser/guest_view/BUILD.gn
@@ -27,4 +27,9 @@ source_set("guest_view") {
     "//components/guest_view/browser",
     "//content/public/common",
   ]
+
+  # This is because guest_view depends on extensions/browser w/o declaring a
+  # dependency. See gn check out/Default extensions/browser/guest_view will
+  # fail.
+  include_dirs = [ "//third_party/flatbuffers/src/include/" ]
 }