Add builders for tracing event's structural arguments

The new classes allow building JSON-like structural arguments. Current implementation uses base::Value as backing store but that can be replaced in the future with something more efficient without changing client code.

All clients of cc/debug/traced_value.h should eventually switch to use the new builders.

BUG=361045

Review URL: https://codereview.chromium.org/380763002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@286849 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: 21261ce03b92ce57e7efc19c681ff788e489de81
6 files changed
tree: 9146783d53a1c8e270b9a5530474a2fa0a7fb466
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/