Refactor Cronet's atom

* Added a new pushed atom [CronetInitialized] that will be logged everytime Cronet is
initialized for the very first time. This is necessary to unblock the development of Cronet Experiment framework
and gain more insights.
* Refactor the older atoms and move some fields to the new atoms. The atoms are still backward compatible.
* See cl/568191940 for more information about the metrics and changes.
* See b/302452793 for the approval of the new metrics along with an Android-metrics-eldar-document.

Bug: 303216384
Bug: 288088422
Bug: 304481024
Test: m libstats_atoms_proto
Change-Id: Ie19a233670a2d6daaaf5fa671696d81113e36f11
2 files changed
tree: 0ca1326b776b8493b98a7e4c5de1a593e51dc3d9
  1. stats/
  2. OWNERS