White screen and scrollbar while touching big and fitted image.

White screen and scrollbar while touching big and fitted image.

[Title] White screen and scrollbar while touching big and fitted image.
[Issue#] N_SE-45748
[Problem] When loaded image, fitting is a feature of webkit and scaled up when clicked.
          But, scaling is consist of two step.
          scaling and scroll.
          Because of multi process arch, these are sent individusaly.
          So, screen was blinked one time.
[Cause] clicking is not proper mobile.
[Solution] Disable scale behavior of clicking image.
           webkit have an option to disable it, but it has another side effect.
           So I just guard it as workaround.

Change-Id: I6ea74d3b22e7207a5cac772c522f51bb141499a1