[Extensions Bindings] Add lastError utilities to APIBindingJSUtil

extensions/renderer/api_last_error.cc

Index: extensions/renderer/api_last_error.cc
diff --git a/extensions/renderer/api_last_error.cc b/extensions/renderer/api_last_error.cc
index 2dafc5e16a2446b916eb904a503d8939f9b6729f..02c5b70b67b4da58955fe1fc621b1eccffc5bcf2 100644
--- a/extensions/renderer/api_last_error.cc
+++ b/extensions/renderer/api_last_error.cc
@@ -146,4 +146,26 @@ void APILastError::ClearError(v8::Local<v8::Context> context,
   parent->Delete(context, key);
 }
 
+bool APILastError::HasError(v8::Local<v8::Context> context) {
+  v8::Isolate* isolate = context->GetIsolate();
+  v8::HandleScope handle_scope(isolate);
+
+  // See comment in SetError().
+  v8::TryCatch try_catch(isolate);
+  try_catch.SetVerbose(true);
+
+  v8::Local<v8::Object> parent = get_parent_.Run(context);
+  if (parent.IsEmpty())
+    return false;
+  v8::Local<v8::Value> error;
+  if (!parent->Get(context, gin::StringToSymbol(isolate, kLastErrorProperty))
+           .ToLocal(&error)) {
+    return false;
+  }
+
+  LastErrorObject* last_error = nullptr;
+  return gin::Converter<LastErrorObject*>::FromV8(context->GetIsolate(), error,
+                                                  &last_error);
+}
+
 }  // namespace extensions