Edje entry: Do not update anchors outside viewport.

Edje entry: Do not update anchors outside viewport.

Summary:
Do not update anchors outside viewport.

Problem is that when entry contains large number of anchors,
scrolling and launch performance is degraded due to lots of objects
being created and maintained, so to enhance the performance of
entry with anchors,  anchors is not  updated outside the viewport.

Test Plan:
1. Should have large number of anchors in entry
2. Observe the launch and scrolling performance.

Reviewers: tasn, raster, herdsman

Subscribers: thiepha, raster, cedric, jpeg

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D3543