This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.desktop.background.gschema.xml is in gsettings-desktop-schemas 3.10.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<schemalist gettext-domain="gsettings-desktop-schemas">
  <schema path="/org/gnome/desktop/background/" id="org.gnome.desktop.background">
    <key type="b" name="draw-background">
      <default>true</default>
      <summary>Draw Desktop Background</summary>
      <description>Have GNOME draw the desktop background. DEPRECATED: This key is deprecated and ignored.</description>
    </key>
    <key name="picture-options" enum="org.gnome.desktop.GDesktopBackgroundStyle">
      <default>'zoom'</default>
      <summary>Picture Options</summary>
      <description>Determines how the image set by wallpaper_filename is rendered. Possible values are "none", "wallpaper", "centered", "scaled", "stretched", "zoom", "spanned".</description>
    </key>
    <key type="s" name="picture-uri">
      <default>'file:///usr/share/themes/Adwaita/backgrounds/adwaita-timed.xml'</default>
      <summary>Picture URI</summary>
      <description>URI to use for the background image. Note that the backend only supports local (file://) URIs.</description>
    </key>
    <key type="i" name="picture-opacity">
      <range min="0" max="100"/>
      <default>100</default>
      <summary>Picture Opacity</summary>
      <description>Opacity with which to draw the background picture.</description>
    </key>
    <key type="s" name="primary-color">
      <default>'#023c88'</default>
      <summary>Primary Color</summary>
      <description>Left or Top color when drawing gradients, or the solid color.</description>
    </key>
    <key type="s" name="secondary-color">
      <default>'#5789ca'</default>
      <summary>Secondary Color</summary>
      <description>Right or Bottom color when drawing gradients, not used for solid color.</description>
    </key>
    <key name="color-shading-type" enum="org.gnome.desktop.GDesktopBackgroundShading">
      <default>'solid'</default>
      <summary>Color Shading Type</summary>
      <description>How to shade the background color. Possible values are "horizontal", "vertical", and "solid".</description>
    </key>
    <key type="b" name="show-desktop-icons">
      <default>false</default>
      <summary>Have file manager handle the desktop</summary>
      <description>If set to true, then file manager will draw the icons on the desktop.</description>
    </key>
  </schema>
</schemalist>