Add queued_time_ms trace for events in message loop

These trace can be useful for examining the status of message loop
queues when debugging some performance issues.

BUG=none

Review URL: https://chromiumcodereview.appspot.com/18083015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@210880 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: e1a38d600ac88e2b70a50f1a95416ccfcb2de858
3 files changed
tree: 9bc59dbd1b207f5561cad110ef41f6602dbc5256
  1. base/
  2. build/
  3. dbus/
  4. ipc/
  5. testing/
  6. third_party/