[Merge] lp:~abreu-alexandre/webbrowser-app/devtools-support into lp:webbrowser-app

[Alexandre Abreu]

When doing this I basically had 2 use cases in mind:

- the webbrowser-app/webapp-container being launched in a debug mode,

- an application (third party) using the ubuntu webview and one wanting to "black box" debug it w/o having to touch it (either because one cannot or should not). I was thinking mostly QA needs to AP test UI componenets that use the UbuntuWebView w/o having to touch it. They would need a way to turn on the devtools w/o having access to the app itself, before being able to drive it w/ selenium etc.

In that context, some sort of an env var seemed ok to me,

The other points have been addressed
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https://code.launchpad.net/~abreu-alexandre/webbrowser-app/devtools-support/+merge/225561
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