Update the relevance metrics tool

This adds tracking of how often type parameters are declared and how
often import prefixes are used.

It also removes the code to convert to and from JSON because we don't
need it.

Change-Id: I7f3b19e9f82bd8aa1b327797726839ff63837795
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149121
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>

https://dart.googlesource.com/sdk/+/cbc6de6c2d0c89f242ae7522cd0103b7252f9b18
1 file changed
tree: 41fb98f31ba07ac0be3269f616835417f3e29b25
  1. commits.json