9a39b8972b
I want to do some refactoring, and it's easier to manage if everything isn't in one big file. No change to functionality in this CL, only moving declarations. CoreLibraryReviewExempt: No code change, only moved to new part files. Change-Id: I4b5e244172302b52a04387372738c46a07807a31 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/462100 Commit-Queue: Lasse Nielsen <lrn@google.com> Reviewed-by: Brian Quinlan <bquinlan@google.com>