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/usr/share/gnome-shell/perf-background.xml is in gnome-shell-common 3.14.4-1~deb8u1.

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The actual contents of the file can be viewed below.

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<!-- With an animated background, performance will differ depending on whether
     one layer or two layers are being blended together. This messes up our
     benchmarks. We could just benchmark a single image, but since blended
     images are present for much of the day with the GNOME default background,
     we want to make sure that also performs well; for that reason we ship
     an "animated" background that animates super-slowly to use during
     performance tests; it will be in the blended state until 2030. -->
<background>
  <starttime>
    <year>1990</year>
    <month>1</month>
    <day>1</day>
    <hour>0</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>

<!-- One transition that takes 40 years -->
<transition type="overlay">
<duration>1261440000.0</duration>
<from>/usr/share/backgrounds/gnome/adwaita-morning.jpg</from>
<to>/usr/share/backgrounds/gnome/adwaita-day.jpg</to>
</transition>

<!-- A single slide doesn't work, so another slide for 1 minute after 40 years -->
<static>
<duration>60</duration>
<file>/usr/share/backgrounds/gnome/Sandstone.jpg</file>
</static>

</background>