[Merge] lp:~ahayzen/webbrowser-app/add-autopilot-multi-window-tests-001 into lp:webbrowser-app/staging

[Olivier Tilloy]

Review: Needs Fixing

switch_to_unfocused_window fails to focus a different window on a phone, and as a consequence the following tests reliably fail:

webbrowser_app.tests.test_history.TestHistory.test_private_window_no_history
webbrowser_app.tests.test_downloads.TestDownloads.test_private_download

They should probably be skipped on touch devices.
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https://code.launchpad.net/~ahayzen/webbrowser-app/add-autopilot-multi-window-tests-001/+merge/309678
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