[misc-usecase][xwalk-1329] Fix blank page after switch css full screen

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android][Tizen IVI]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #388 from haoxli/haoxli/misc-usecase/xwalk-1329

[misc-usecase][xwalk-1329] Fix blank page after switch css full screen