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/usr/share/dbus-1/interfaces/com.canonical.Unity.Input.xml is in unity-system-compositor 0.4.3+16.04.20160323-0ubuntu1.

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The actual contents of the file can be viewed below.

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<!DOCTYPE node PUBLIC '-//freedesktop//DTD D-BUS Object Introspection 1.0//EN' 'http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd'>
<node>
  <interface name='com.canonical.Unity.Input'>
    <method name='setMousePrimaryButton'>
      <arg name='button' type='i' direction='in'/>
    </method>
    <method name='setMouseCursorSpeed'>
      <arg name='speed' type='d' direction='in'/>
    </method>
    <method name='setMouseScrollSpeed'>
      <arg name='speed' type='d' direction='in'/>
    </method>
    <method name='setTouchpadPrimaryButton'>
      <arg name='button' type='i' direction='in'/>
    </method>
    <method name='setTouchpadCursorSpeed'>
      <arg name='speed' type='d' direction='in'/>
    </method>
    <method name='setTouchpadScrollSpeed'>
      <arg name='speed' type='d' direction='in'/>
    </method>
    <method name='setTouchpadDisableWhileTyping'>
      <arg name='enable' type='b' direction='in'/>
    </method>
    <method name='setTouchpadTapToClick'>
      <arg name='enable' type='b' direction='in'/>
    </method>
    <method name='setTouchpadTwoFingerScroll'>
      <arg name='enable' type='b' direction='in'/>
    </method>
    <method name='setTouchpadDisableWithMouse'>
      <arg name='enable' type='b' direction='in'/>
    </method>
  </interface>
</node>