[turbolizer] Add dev server

You can now serve the page locally by running

npm i
npm run-script build
npm run-script dev-server

Notry: true
Change-Id: Iefe8459a8c53445570ecfed4cc843a4e8ed9c42d
Bug: v8:7327
Reviewed-on: https://chromium-review.googlesource.com/c/1309753Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57163}

tools/turbolizer/package.json

@@ -7,7 +7,8 @@
     "watch": "tsc --watch",
     "deploy": "./deploy.sh",
     "format": "tsfmt -r",
-    "test": "ts-mocha -p tsconfig.test.json test/**/*-test.ts"
+    "test": "ts-mocha -p tsconfig.test.json test/**/*-test.ts",
+    "dev-server": "ws"
   },
   "author": "The V8 team",
   "license": "MIT",
@@ -28,6 +29,7 @@
     "mocha": "^5.2.0",
     "ts-mocha": "^2.0.0",
     "typescript": "^2.9.1",
-    "typescript-formatter": "^7.2.2"
+    "typescript-formatter": "^7.2.2",
+    "local-web-server": "^2.6.0"
   }
 }