HYDRA-154: Added the COLLECT_METRICS param so we can collect (but not parse) metrics
HYDRA-154: updated canvas to use new var for metrics generation
Merge branch 'hydra' of github.com:WebFilings/pdf.js into bat/HYDRA-154
HDYRA-154: changes the var names tos omething mroe descriptive as per code review
Merge pull request #10 from WebFilings/bat/HYDRA-154

HYDRA-154: add a line metrics unit test