Re-enable ViewPropAnimRT

Change-Id: I2f30547c4e2212747c479760dff4f3f901d1eaf3
diff --git a/libs/hwui/Animator.cpp b/libs/hwui/Animator.cpp
index eff3011..dc6d852 100644
--- a/libs/hwui/Animator.cpp
+++ b/libs/hwui/Animator.cpp
@@ -160,6 +160,10 @@
     (target->mutateStagingProperties().*mPropertyAccess->setter)(finalValue());
 }
 
+uint32_t RenderPropertyAnimator::dirtyMask() {
+    return mPropertyAccess->dirtyMask;
+}
+
 float RenderPropertyAnimator::getValue(RenderNode* target) const {
     return (target->properties().*mPropertyAccess->getter)();
 }