Implements getImageAnimationPolicy() at ImageLoader.

Source/core/testing/Internals.idl

Index: Source/core/testing/Internals.idl
diff --git a/Source/core/testing/Internals.idl b/Source/core/testing/Internals.idl
index 122392d0a7fbfb747dc976d1b77b76a360a7abf7..e9bdba67b088aff21aecadaa37491720b8874ecd 100644
--- a/Source/core/testing/Internals.idl
+++ b/Source/core/testing/Internals.idl
@@ -67,6 +67,9 @@
     // CSS Animation and Transition testing.
     [RaisesException] void pauseAnimations(double pauseTime);
 
+    // Advances Time to test whether animated images work properly.
+    [RaisesException] void advanceTimeWithImage(Element image, double advancedTime);
+
     [RaisesException, TypeChecking=Interface] Node nextSiblingInComposedTree(Node node);
     [RaisesException, TypeChecking=Interface] Node firstChildInComposedTree(Node node);
     [RaisesException, TypeChecking=Interface] Node lastChildInComposedTree(Node node);