2.4/user/src/com/google/gwt/animation/Animation.gwt.xml

<!--                                                                        -->
<!-- Copyright 2008 Google Inc.                                             -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Module used to include Animation class.                                -->
<!--                                                                        -->
<!-- This module is typically inherited via com.google.gwt.user.User        -->
<!--                                                                        -->
<module>
  <inherits name="com.google.gwt.core.Core"/>
  <inherits name="com.google.gwt.user.UserAgent"/>
  
  <!-- Include User module to inherit Timer -->
  <inherits name="com.google.gwt.user.User"/>

  <!-- Fallback implementation, based on a timer -->
  <replace-with class="com.google.gwt.animation.client.AnimationSchedulerImplTimer">
    <when-type-is class="com.google.gwt.animation.client.AnimationScheduler"/>
  </replace-with>

  <!-- Implementation based on mozRequestAnimationFrame -->
  <replace-with class="com.google.gwt.animation.client.AnimationSchedulerImplMozilla">
    <when-type-is class="com.google.gwt.animation.client.AnimationScheduler"/>
    <when-property-is name="user.agent" value="gecko1_8"/>
  </replace-with>

  <!-- Implementation based on webkitRequestAnimationFrame -->
  <replace-with class="com.google.gwt.animation.client.AnimationSchedulerImplWebkit">
    <when-type-is class="com.google.gwt.animation.client.AnimationScheduler"/>
    <when-property-is name="user.agent" value="safari"/>
  </replace-with>
</module>