ViewGroup.java

@Override
public final void invalidateChild(View child, final Rect dirty) {
    final AttachInfo attachInfo = mAttachInfo;
    if (attachInfo != null && attachInfo.mHardwareAccelerated) {
        // HW accelerated fast path
        onDescendantInvalidated(child, child);
        return;
    }
    // A bunch of code here for old slow path
    parent.invalidateChildInParent(location, dirty);
}