e2e test for transformer (webdriver + pub serve)

tool/transformer_test.sh

 #!/bin/bash
 set -eu
-DIR=$(dirname "${BASH_SOURCE[0]}")
+cd $( dirname "${BASH_SOURCE[0]}" )/..
 
-# TODO(ochafik): Run pub serve + launch a browser on
-# http://localhost:8080/hello_app/web/
+export CHROME_CANARY_BIN=`./tool/get_chrome_canary.sh`
+
+echo "*** Testing pub serve + DDC transformer"
+pub run test --timeout 120s test/transformer_e2e_test.dart
+
+echo "*** Testing pub build + DDC transformer"
 cd test/transformer/hello_app
 pub get
 pub build
 
 expected_files=(
+  build/web/hello_app/web/index.html
   build/web/hello_app/web/main.js
   build/web/hello_dep/simple.js
   build/web/hello_dep/utils.js
   # This is not an exhaustive check:
   build/web/dev_compiler/runtime/dart/_runtime.js
 )
 
 for file in "${expected_files[@]}" ; do
   if [[ ! -f $file ]]; then
     echo "Didn't find $file in build:"
     find build | grep -v /packages/
     exit 1
   fi
 done