[Tizen] Fix SystemIndicatorWatcher event coordinates according to scale

TizenSystemIndicatorWatcher now is getting the device scale to
recalculate event coordinates.

BUG=https://crosswalk-project.org/jira/browse/XWALK-748
Merge pull request #1389 from ricardotk/indi-debug

[Tizen] Fix SystemIndicatorWatcher event coordinates according to device scale