b75df6f268
'result' from an external 'compileExpression' implementation Also adds expression evaluation tests for external clients. Change-Id: Ibc1ee098df1de4d191627cbccb44e24fbcb43adf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/154300 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Ben Konyi <bkonyi@google.com>