[tracing] Expose level of detail of memory dumps in the trace JSON

[tracing] Expose level of detail of memory dumps in the trace JSON

This small CL exposes a "level_of_detail" field in the trace JSON,
as a sibling of "allocators". e.g.,

"dumps":{
 "allocators":{...},
 "allocators_graph":[...],
 "level_of_detail":"light",
 "process_totals":{...}
}

BUG=524345
Committed: https://crrev.com/df2ce273eeb2a30602349d3e7f0de5a445abccbc
Cr-Commit-Position: refs/heads/master@{#348861}

[Primiano Tucci (use gerrit), 2015-09-14 13:10:52]

primiano@chromium.org changed reviewers:
+ petrcermak@chromium.org

[Primiano Tucci (use gerrit), 2015-09-14 13:10:52]

PTAL, small patch. Of course after reviewing this you'll need to do the UI (just
the bubble colour is fine for the moment)

[petrcermak, 2015-09-14 13:18:04]

LGTM.

Thanks,
Petr

[Primiano Tucci (use gerrit), 2015-09-15 09:03:22]

The CQ bit was checked by primiano@chromium.org

[commit-bot: I haz the power, 2015-09-15 09:03:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1344543002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1344543002/1

[commit-bot: I haz the power, 2015-09-15 10:03:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-15 10:04:37]

Patchset 1 (id:??) landed as
https://crrev.com/df2ce273eeb2a30602349d3e7f0de5a445abccbc
Cr-Commit-Position: refs/heads/master@{#348861}

[commit-bot: I haz the power, 2015-09-23 12:43:49]

Patchset 1 (id:??) landed as
https://crrev.com/df2ce273eeb2a30602349d3e7f0de5a445abccbc
Cr-Commit-Position: refs/heads/master@{#348861}