Use source type as title for top level events
Merge pull request #649 from xunjieli/source_type_as_title

Use source type as the title for top level events
Remove MeasuringStick
Cleanup gn and gyp files.
Merge pull request #650 from dj2/remove_measuring_stick

Remove MeasuringStick
Remove unused bar-chart class
Merge pull request #651 from dj2/remove_bar_chart

Remove unused bar-chart class
Remvoe bar-chart CSS.
Merge pull request #652 from dj2/remove_bar_chart_css

Remove bar-chart CSS.