make ssr version take current context via argument

Author: yyx990803

index.js

@@ -59,8 +59,8 @@ module.exports.pitch = function (remainingRequest) {
     return shared.concat([
       '// add CSS to SSR context',
       'var add = require(' + addStylesServerPath + ')',
-      'module.exports.__inject__ = function () {',
-      '  add(' + id + ', content, ' + isProduction + ')',
+      'module.exports.__inject__ = function (context) {',
+      '  add(' + id + ', content, ' + isProduction + ', context)',
       '};'
     ]).join('\n')
   }

lib/addStylesServer.js

@@ -1,8 +1,7 @@
 var listToStyles = require('./listToStyles')
 
-module.exports = function (parentId, list, isProduction) {
-  if (typeof __VUE_SSR_CONTEXT__ !== 'undefined') {
-    var context = __VUE_SSR_CONTEXT__
+module.exports = function (parentId, list, isProduction, context) {
+  if (context) {
     var styles = context._styles
 
     if (!styles) {