Update high-resolution-time.json

Added a demo
Add bug tracking links of Webkit non-support of vh/vw units in calc()
Merge pull request #540 from AurelioDeRosa/patch-1

Update high-resolution-time.json
Merge pull request #542 from mems/patch-1

Add bug tracking links of Webkit non-support of vh/vw units in calc()
data update