[Tracing] Remove context_id in favor of traits

This CL also changes on the ContextId function to become a BindId function, to allow easier integation with third_party tracing integration.

BUG=570851

Review URL: https://codereview.chromium.org/1539703002

Cr-Commit-Position: refs/heads/master@{#366123}


CrOS-Libchrome-Original-Commit: e421277aa047bcbf61c965a57f1eb02dc1a582a2
5 files changed
tree: c16bde511a59f1b230f54ce827527dd50c1097da
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/