use key-queue for input

src/shared/actions.js

@@ -0,0 +1,22 @@
+export const TABS_PREV = 'tabs.prev';
+export const TABS_NEXT = 'tabs.next';
+export const SCROLL_UP = 'scroll.up';
+export const SCROLL_DOWN = 'scroll.down';
+
+const BACKGROUND_ACTION_SET = new Set([
+  TABS_PREV,
+  TABS_NEXT
+]);
+
+const CONTENT_ACTION_SET = new Set([
+  SCROLL_UP,
+  SCROLL_DOWN
+]);
+
+export const isBackgroundAction = (action) => {
+  return BACKGROUND_ACTION_SET.has(action);
+};
+
+export const isContentAction = (action) => {
+  return CONTENT_ACTION_SET.has(action);
+};