Add missing type info for mkdirp

chrome-launcher/package.json

@@ -10,11 +10,12 @@
     "format": "clang-format -i -style=file *.ts"
   },
   "devDependencies": {
+    "clang-format": "^1.0.50",
     "mocha": "^3.2.0",
-    "typescript": "2.2.1",
-    "clang-format": "^1.0.50"
+    "typescript": "2.2.1"
   },
   "dependencies": {
+    "@types/mkdirp": "^0.3.29",
     "@types/node": "6.0.66"
   }
 }

chrome-launcher/yarn.lock

@@ -2,6 +2,10 @@
 # yarn lockfile v1
 
 
+"@types/mkdirp@^0.3.29":
+  version "0.3.29"
+  resolved "https://registry.yarnpkg.com/@types/mkdirp/-/mkdirp-0.3.29.tgz#7f2ad7ec55f914482fc9b1ec4bb1ae6028d46066"
+
 "@types/node@6.0.66":
   version "6.0.66"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-6.0.66.tgz#5680b74a6135d33d4c00447e7c3dc691a4601625"