Index: content/public/browser/push_messaging_service.h |
diff --git a/content/public/browser/push_messaging_service.h b/content/public/browser/push_messaging_service.h |
index f44144ce08be31ff5b45761922b2fb1c93a85bc4..5682463ce39b20dcd0acf71ee0d7a71289a56702 100644 |
--- a/content/public/browser/push_messaging_service.h |
+++ b/content/public/browser/push_messaging_service.h |
@@ -16,7 +16,7 @@ |
namespace content { |
// A push service-agnostic interface that the Push API uses for talking to |
-// push messaging services like GCM. |
+// push messaging services like GCM. Must only be used on the UI thread. |
class CONTENT_EXPORT PushMessagingService { |
public: |
typedef base::Callback<void(const std::string& /* registration_id */, |