Chrome driver should support linux

[jasonLaster]

@wldcordeiro and I worked on a quick patch for chrome, but here's the gist of it:

diff --git a/packages/devtools-launchpad/bin/chrome-driver.js b/packages/devtools-launchpad/bin/chrome-driver.js
index 7670a01..764bf44 100644
--- a/packages/devtools-launchpad/bin/chrome-driver.js
+++ b/packages/devtools-launchpad/bin/chrome-driver.js
@@ -1,8 +1,12 @@
 #!/usr/bin/env node

 const spawn = require('child_process').spawn;
+const isLinux = /^linux/.test(process.platform);

-const chromeBinary = "/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome"
+let chromeBinary= = "/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome";
+if (isLinux) {
+  chromeBinary = /* some linuxy solution for finding the path */
+}

[tromey]

One simple way would be to just

chromeBinary = 'google-chrome';

and assume that it can be found in $PATH.

[AnshulMalik]

This is fixed now.