Blimp: Added spinner to text input dialog

blimp/engine/feature/engine_render_widget_feature.h

Index: blimp/engine/feature/engine_render_widget_feature.h
diff --git a/blimp/engine/feature/engine_render_widget_feature.h b/blimp/engine/feature/engine_render_widget_feature.h
index 653916d4275f9838dfec87a47cbb5624e7949267..b756b2c33093ec145cd88f55a1859a594327761c 100644
--- a/blimp/engine/feature/engine_render_widget_feature.h
+++ b/blimp/engine/feature/engine_render_widget_feature.h
@@ -182,6 +182,8 @@ class EngineRenderWidgetFeature : public BlimpMessageProcessor,
   std::unique_ptr<BlimpMessageProcessor> input_message_sender_;
   std::unique_ptr<BlimpMessageProcessor> ime_message_sender_;
 
+  base::WeakPtrFactory<EngineRenderWidgetFeature> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(EngineRenderWidgetFeature);
 };