Summary:
Added a graph to show how much data is sent to plugins. The tooltip shows a sorted overview of the amount of data.
Will put up a GK so that plugin devs can get this data also more easily
Reviewed By: jknoxville
Differential Revision: D20919321
fbshipit-source-id: f2b78b21ef34551e0ed562b009589d2a5dba9ff3
