Fix for screen shift upward after showing ime
Fix for screen shift upward after showing ime

[Title]    Fix for screen shift upward after showing ime
[Issue#]   P130902-00494
[Problem]  Screen shift upward after showing ime
[Cause]    Do not update visible content when input field zoom
[Solution] update visible content rect when input fileld zoom

Change-Id: I1f88c845455550b693f7d03c3c3f374b3987ccad

youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl,youfoh/webkit-efl