Binds two IDs together.

This macro provides a mechanism to tell trace consumers
that two different IDs are actually identical and they
refer to the same thing.

For more context:
https://docs.google.com/a/google.com/document/d/1s0DKjNJk85hDuRp5IqujwZvPML-MPsyAtDeksMwBw7s/edit?usp=sharing

BUG=catapult:#2465

Review-Url: https://codereview.chromium.org/2142023003
Cr-Commit-Position: refs/heads/master@{#406648}
4 files changed