Removing unnecessary XML declaration prolog when embedding SVGs
as data URI and adding more complex elements & attributes to test.
Bug: T175318
Change-Id: Ibec8c2ab498554a6ad33b4420ae6258dcc80fcdf
Do not base64-encode non-binary files (containing only whitespace and
printable ASCII characters, which matches sane SVG files).
For SVG files the percent-encoded URIs are actually slightly longer
than the base64-encoded ones (~10%), but compress a lot better
resulting on 15-20% less data to transfer after gzip compression.
(The effect is best seen on the 'oojs-ui' module, which consists
mostly of SVG icons – especially after commenting out everything other
than 'oojs-ui.svg.css'.)
I tried this for binary files too, just in case; but as expected, they
suffer from a noticeable size increase even with compression (~15%).
Bug: 67341
Change-Id: Iddaf863b6be98570a2bb8e606f13946a96345f65
Also added commented-out tests which should work, but don't.
Making them work in subsequent patch If9082f55.
Change-Id: I65f62493e6d10e7e90af8844f8a26e3982d75f51
