[misc-usecase] Fix XWALK-2071 to change the url of image

- Fix XWALK-2071 bug to change the url of image is valid

Impacted tests(approved): new 0, update 1, delete 0
Unit test platform: [Android]
Unit test result summary: pass 1, fail 0, block 0
Merge pull request #408 from yunxliu/yunxliu/misc/modify_performance_timeline

[misc-usecase] Fix XWALK-2071 to change the url of image