[Extensions Bindings] Add lastError utilities to APIBindingJSUtil

extensions/renderer/api_last_error.h

Index: extensions/renderer/api_last_error.h
diff --git a/extensions/renderer/api_last_error.h b/extensions/renderer/api_last_error.h
index 68ed4dd2a957ad79456f7c25f43e725beff43e7d..95126fe62fc5e148a695c0c32fb811985708cb85 100644
--- a/extensions/renderer/api_last_error.h
+++ b/extensions/renderer/api_last_error.h
@@ -33,6 +33,9 @@ class APILastError {
   // true and the developer didn't check the error, this throws an exception.
   void ClearError(v8::Local<v8::Context> context, bool report_if_unchecked);
 
+  // Returns true if the given context has an active error.
+  bool HasError(v8::Local<v8::Context> context);
+
  private:
   GetParent get_parent_;