Improve minification of frontend Polymer Elements

appengine/swarming/elements/Makefile

 # Copyright 2016 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 # Set up the local directory to run the demo pages.
 
 default:
         bower install
 
 # Run a local HTTP server for the demo pages.
 .PHONY: run
 run: default
         -wget -nc --output-document=./res/imp/botlist/bot-list-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/bot-list-demo.json
         -wget -nc --output-document=./res/imp/botlist/bot-list-fleet-data-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/bot-list-fleet-data-demo.json
         -wget -nc --output-document=./res/imp/tasklist/task-list-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/task-list-demo.json
         -wget -nc --output-document=./res/imp/tasklist/task-list-fleet-data-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/task-list-fleet-data-demo.json
         -wget -nc --output-document=./res/imp/tasklist/task-tags-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/task-tags-demo.json
 
         -wget -nc --output-document=./res/imp/botpage/bot-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/bot-demo.json
         -wget -nc --output-document=./res/imp/botpage/bot-events-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/bot-events-demo.json
         -wget -nc --output-document=./res/imp/botpage/bot-tasks-demo.json https://raw.githubusercontent.com/wiki/luci/luci-py/bot-tasks-demo.json
 
         node_modules/.bin/http-server -p 9050
 
 
 .PHONY: vulcanize
 vulcanize: default
         rm -rf ./build/*
         mkdir ./build/js
-        ./node_modules/.bin/vulcanize --inline-css=true --inline-scripts=true --strip-comments=true --abspath=./ --out-html=./build/elements.html elements.html
+        ./node_modules/.bin/vulcanize --inline-css --inline-scripts --strip-comments --abspath=./ elements.html | ./node_modules/.bin/html-minifier -o ./build/elements.html --minify-css --minify-js --remove-comments --collapse-whitespace --conservative-collapse
         cat ./res/imp/bower_components/webcomponentsjs/webcomponents-lite.min.js ./node_modules/skia-common-js/common.js ./res/js/common.js ./res/js/alias.js | ./node_modules/.bin/uglifyjs -o ./build/js/js.js
 
 .PHONY: debug_build
 debug_build: default
         rm -rf ./build/*
         mkdir ./build/js
         cp elements.html ./build/elements.html
         cat ./res/imp/bower_components/webcomponentsjs/webcomponents-lite.min.js ./node_modules/skia-common-js/common.js ./res/js/common.js ./res/js/alias.js > ./build/js/js.js
         ln --symbolic ../res/imp/ ./build/
 
 .PHONY: dev_deploy
 dev_deploy: vulcanize
         ../tools/gae upl -A chromium-swarm-dev
 
 .PHONY: deploy
 deploy: vulcanize
         ../tools/gae upl -A chromium-swarm
 
 .PHONY: local_deploy
 local_deploy: vulcanize
         ../tools/start_servers.py
 
 .PHONY: debug_local_deploy
 debug_local_deploy: debug_build
         ../tools/start_servers.py