feat(webpackDevServer): Add watchOptions for webpackDevServer (angular#1814)

Add watchOptions to webpackDevServerConfiguration to conditionally enable
polling option in watchpack
Remove additional blank lines from end of serve-watchpack.ts so that only
one is remaining

Author: JSMike

packages/angular-cli/lib/config/schema.d.ts

@@ -59,5 +59,6 @@ export interface CliConfig {
     defaults?: {
         styleExt?: string;
         prefixInterfaces?: boolean;
+        poll?: number;
     };
 }

packages/angular-cli/lib/config/schema.json

@@ -135,10 +135,13 @@
         },
         "prefixInterfaces": {
           "type": "boolean"
+        },
+        "poll": {
+          "type": "number"
         }
       },
       "additionalProperties": false
     }
   },
   "additionalProperties": false
-}
+}

packages/angular-cli/tasks/serve-webpack.ts

@@ -69,7 +69,10 @@ export default Task.extend({
       stats: webpackDevServerOutputOptions,
       inline: true,
       https: commandOptions.ssl,
-      proxy: proxyConfig
+      proxy: proxyConfig,
+      watchOptions: {
+        poll: CliConfig.fromProject().config.defaults.poll
+      }
     };
 
     if (sslKey != null && sslCert != null) {