[Merge] lp:~osomon/webbrowser-app/loadEvent-optimizations into lp:webbrowser-app

[Olivier Tilloy]

Olivier Tilloy has proposed merging lp:~osomon/webbrowser-app/loadEvent-optimizations into lp:webbrowser-app.

Commit message:
Various performance optimizations linked to load events:
 - perform all history database accesses asynchronously, on a separate thread
 - delay changing the 'loading' state, to allow for very brief load sequences to not update the UI (which would result in inelegant flickering)
 - do not trigger a capture of the webview for every single load event, only those that succeed or that fail

Requested reviews:
  Ubuntu Phablet Team (phablet-team)
Related bugs:
  Bug #1611680 in webbrowser-app (Ubuntu): "Scrolling on  www.ceskenoviny.cz is very slow"
  https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1611680

For more details, see:
https://code.launchpad.net/~osomon/webbrowser-app/loadEvent-optimizations/+merge/307006
-- 
Your team Ubuntu Phablet Team is requested to review the proposed merge of lp:~osomon/webbrowser-app/loadEvent-optimizations into lp:webbrowser-app.
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