2c5cd7820f
Adds an index for extension types and their members. Refactors some members in this file to better reflect what's being indexed. Change-Id: Ic397a5bfe1a8f9671a92f82c94f023faeeb5acac Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/332861 Reviewed-by: Johnni Winther <johnniwinther@google.com> Commit-Queue: Srujan Gaddam <srujzs@google.com>