Resize PhantomJS to 1280x1024 when the browser opens

By default PhantomJS uses 400x300 window size. That causes some tests
to fail because the window is to small. 1280x1024 would be a better
default size.

Bug: 60044
Change-Id: Ib331d703ce18bd6ade418107fed73a6a71d71fae
Merge "Resize PhantomJS to 1280x1024 when the browser opens"