Fixed b/65407087

Author: michaelawyu

appengine/standard/flask/hello_world/README.md

@@ -3,9 +3,4 @@
 This sample shows how to use [Flask](http://flask.pocoo.org/) with Google App
 Engine Standard.
 
-Before running or deploying this application, install the dependencies using
-[pip](http://pip.readthedocs.io/en/stable/):
-
-    pip install -t lib -r requirements.txt
-
 For more information, see the [App Engine Standard README](../../README.md)

appengine/standard/flask/hello_world/app.yaml

@@ -5,3 +5,8 @@ threadsafe: true
 handlers:
 - url: /.*
   script: main.app
+
+# Using flask as a built-in third-party library
+libraries:
+- name: flask
+  version: latest

appengine/standard/flask/hello_world/appengine_config.py

@@ -15,3 +15,4 @@ webapp2==2.5.2
 google-api-python-client==1.6.4
 google-cloud-core==0.28.0
 gcp-devrel-py-tools==0.0.11
+flask==0.12