Path FLUTTER_STORAGE_BASE_URL 在flutter master上面工作不友好

Windows 10.
• Flutter version 1.18.0-14.0.pre.21 at D:\Android\flutter
• Framework revision da66a45 (7 hours ago), 2020-05-08 00:29:01 -0700
• Engine revision 3953c3c
• Dart version 2.9.0 (build 2.9.0-5.0.dev 4da5b40fb6)

1. https://github.com/flutter/flutter/blob/master/packages/flutter_tools/gradle/flutter.gradle
   这个文件203行：
   String hostedRepository = System.env.FLUTTER_STORAGE_BASE_URL ?: DEFAULT_MAVEN_HOST
   String repository = useLocalEngine()
   ? project.property('local-engine-repo')
   : "https://$hostedRepository/download.flutter.io"

配置在Path中的变量“FLUTTER_STORAGE_BASE_URL”值是 https://xxxxxxx
例如https://flutter.dev/community/china中的示例
但是在Gradle编译构建中却出现了 https://https/storage.flutter-io.cn/xxxxx 的资源获取地址
比如

是的，今天更新 f6b47a5 之前是没有上述问题的。

2. 若配置了FLUTTER_STORAGE_BASE_URL ，在Flutter Module 项目下 flutter build aar 的也是不友好的，因为storageUrl 值为https://xxxxxx 的url.
   如：
   String storageUrl = System.env.FLUTTER_STORAGE_BASE_URL ?: "storage.googleapis.com"
   repositories {
   maven {
   url "https://$storageUrl/download.flutter.io"
   }
   }
   建议修改：
   String storageUrl = System.env.FLUTTER_STORAGE_BASE_URL ?: "https://storage.googleapis.com"
   repositories {
   maven {
   url "$storageUrl/download.flutter.io"
   }
   }

3. 若配置FLUTTER_STORAGE_BASE_URL值为storage.flutter-io.cn ，flutter upgrade 等命令将无法正常工作。