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