[tracing] Implement polling in MemoryDumpManager

Implement polling for memory totals when peak triggers are given in
trace config. It also triggers dumps if there is a big increase in
memory total.

BUG=607533

Review-Url: https://codereview.chromium.org/2582453002
Cr-Original-Commit-Position: refs/heads/master@{#451386}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 5047017bdca8641764919bcbb25b60b8d89c5684
1 file changed
tree: ae911b8aafe64898db236ad14f93e7994081dbf8
  1. tools/