Reenabling TestStop

- Added contrib/grab-headless_shell.sh to grab latest headless_shell
- Changed travis config to use contrib/grab-headless_shell.sh
- Reenabled TestStop since Page.stopLoading is now available with latest
  available headless_shell

.travis.yml

@@ -3,10 +3,8 @@ go:
   - 1.7
   - tip
 before_install:
-  - mkdir -p $HOME/hs
-  - wget -O $HOME/hs/hs.tar.bz2 https://storage.googleapis.com/docker-chrome-headless/headless_shell.tar.bz2
-  - tar -jxvf $HOME/hs/hs.tar.bz2 -C $HOME/hs
   - go get github.com/mattn/goveralls
+  - ./contrib/grab-headless_shell.sh $HOME/hs
 script:
   - export CHROMEDP_NO_SANDBOX=true
   - export PATH=$PATH:$HOME/hs

contrib/grab-headless_shell.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+set -e
+
+OUT=${1:-headless_shell}
+VER=$2
+
+if [ -z "$VER" ]; then
+  VER=$(curl -s https://storage.googleapis.com/docker-chrome-headless/latest.txt|sed -e 's/^headless_shell-//' -e 's/\.tar\.bz2$//')
+fi
+
+mkdir -p $OUT
+
+pushd $OUT &> /dev/null
+
+curl -s https://storage.googleapis.com/docker-chrome-headless/headless_shell-$VER.tar.bz2 | tar -jxv
+
+popd &> /dev/null

nav_test.go

@@ -276,7 +276,6 @@ func TestNavigateForward(t *testing.T) {
 }
 
 func TestStop(t *testing.T) {
-	t.Skip("Page.stopLoading not available")
 	t.Parallel()
 
 	var err error