tree 1cc9593b26a4723ebf6002c77c5add6dee4e71f5
parent 975858e765df03c11e00a1262ad36520f2976594
author Matt Rosencrantz <mattr@google.com> 1423785885 -0800
committer Matt Rosencrantz <mattr@google.com> 1423785887 -0800

namespace-browser: Implement vtrace (part 1 of many)

In this CL I add a basic implementation of vtrace spans and the vtrace
store.  Also add enough functionality to collect trace data when
javascript is acting as a client.

There are many shortcomings which will be addressed by future CLs.
- The store always collects, there is no pattern based collection as in go.
- JS servers never return trace information
- There is no interface to dump traces from the console / etc.

MultiPart: 4/4
Change-Id: I50c5bd7c6c2c348c3e94bd739757c1edb44b62f3