Enhance gc-nvp-trace-processor.py: - correctly display time spent in scavenger (it was attributed to 'other' scope). - display time spent in 'external' scope.
Enhance gc-nvp-trace-processor.py:
- correctly display time spent in scavenger (it was attributed to 'other' scope).
- display time spent in 'external' scope.

Review URL: http://codereview.chromium.org/7067022

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@8030 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh