[Extensions Bindings] Add native declarativeContent verification

extensions/renderer/api_binding.cc

Index: extensions/renderer/api_binding.cc
diff --git a/extensions/renderer/api_binding.cc b/extensions/renderer/api_binding.cc
index 8652b713c11623ece33c9a30f45d710ed19f20db..5997512d0d13b47850238c3a442feef8290b29ff 100644
--- a/extensions/renderer/api_binding.cc
+++ b/extensions/renderer/api_binding.cc
@@ -376,6 +376,10 @@ void APIBinding::InitializeTemplate(v8::Isolate* isolate) {
                                    *property_definitions_);
   }
 
+  // Allow custom bindings a chance to tweak the template, such as to add
+  // additional properties or types.
+  binding_hooks_->InitializeTemplate(isolate, object_template, *type_refs_);
+
   object_template_.Set(isolate, object_template);
 }