add set property action in background

src/background/actions/index.js

@@ -1,4 +1,5 @@
 export default {
   // Settings
   SETTING_SET_SETTINGS: 'setting.set.settings',
+  SETTING_SET_PROPERTY: 'setting.set.property',
 };

src/background/actions/setting.js

@@ -10,4 +10,12 @@ const load = () => {
   });
 };
 
-export { load };
+const setProperty = (name, value) => {
+  return {
+    type: actions.SETTING_SET_PROPERTY,
+    name,
+    value,
+  };
+};
+
+export { load, setProperty };

src/background/reducers/setting.js

@@ -1,4 +1,4 @@
-import actions from 'settings/actions';
+import actions from 'background/actions';
 
 const defaultState = {
   value: {},
@@ -10,6 +10,13 @@ export default function reducer(state = defaultState, action = {}) {
     return {
       value: action.value,
     };
+  case actions.SETTING_SET_PROPERTY:
+    return {
+      value: Object.assign({}, state.value, {
+        properties: Object.assign({}, state.value.properties,
+          { [action.name]: action.value })
+      })
+    };
   default:
     return state;
   }