Commits on Mar 23, 2015

1. Print trees in the memory profiler's output. …

   Memory reports are much nicer to read when grouped into trees, which requires giving each report a path instead of a name.
   
   Sample output:
   ```
   Begin memory reports
   |
   |    2.51 MiB -- pages
   |       2.51 MiB -- url(file:///home/njn/moz/servo/../servo-static-suite/wikipedia/Guardians%20of%20the%20Galaxy%20(film)%20-%20Wikipedia,%20the%20free%20encyclopedia.html)
   |          2.51 MiB -- display-list
   |
   |  238.89 MiB -- resident-according-to-smaps
   |     188.31 MiB -- anonymous (rw-p)
   |      27.29 MiB -- /home/njn/moz/servo/components/servo/target/debug/servo (r-xp)
   |       7.82 MiB -- other
   |       6.65 MiB -- [heap] (rw-p)
   |       3.55 MiB -- /usr/lib/x86_64-linux-gnu/dri/i965_dri.so (r-xp)
   |       1.42 MiB -- /lib/x86_64-linux-gnu/libc-2.19.so (r-xp)
   |       1.13 MiB -- /home/njn/moz/servo/components/servo/target/debug/servo (r--p)
   |       0.74 MiB -- /usr/lib/x86_64-linux-gnu/libX11.so.6.3.0 (r-xp)
   |       0.73 MiB -- /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.20 (r-xp)
   |       0.65 MiB -- /lib/x86_64-linux-gnu/libm-2.19.so (r-xp)
   |       0.60 MiB -- /lib/x86_64-linux-gnu/libglib-2.0.so.0.4200.1 (r-xp)
   |
   |   71.08 MiB -- jemalloc-heap-active
   |   59.11 MiB -- jemalloc-heap-allocated
   |  180.00 MiB -- jemalloc-heap-mapped
   |  232.87 MiB -- resident
   |   54.43 MiB -- system-heap-allocated
   | 3130.11 MiB -- vsize
   |
   End memory reports
   ```

   

   nnethercote committed Mar 23, 2015
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