Revert "Disable current matrix."

This reverts commit e0bb84be.

Reason for revert: needs to be reverted in sc-dev-plus-aosp and below
    to re-enable the T matrix on aosp/master-..->goog/master

Change-Id: I538533d21e624f8ee5a392d0ee7618ee0969ec87
Merged-In: I4525301ad1205cf41937a98b7b9f67f052cb5bd9