Enable builtin Mojo JS modules in layout tests

content/renderer/mojo_context_state.h

Index: content/renderer/mojo_context_state.h
diff --git a/content/renderer/mojo_context_state.h b/content/renderer/mojo_context_state.h
index f6516b4f71a452b3469338cff28400ce88042f6a..c9af2621868dd1d0dfa7718d7f90c313b2eb1710 100644
--- a/content/renderer/mojo_context_state.h
+++ b/content/renderer/mojo_context_state.h
@@ -33,7 +33,9 @@ class MojoMainRunner;
 // by way of gin. Non-builtin modules are downloaded by way of ResourceFetchers.
 class MojoContextState : public gin::ModuleRegistryObserver {
  public:
-  MojoContextState(blink::WebFrame* frame, v8::Local<v8::Context> context);
+  MojoContextState(blink::WebFrame* frame,
+                   v8::Local<v8::Context> context,
+                   bool for_layout_tests);
   ~MojoContextState() override;
 
   void Run();