We use previously added `CompilationUnitElementImpl.macroGeneratedContent`
to access the current combined content.
In order to make this work with current IntelliJ plugin, without
adding new protocols, we store the generated code into a new file,
and locations for macro-generated elements are in this file.
Locations for elements that are not macro-generated are still
in the source file.
We use `ElementLocationProvider` to separate writing to the file
system, and do this only in DAS.
Change-Id: Ib156c67b0bf1f3474eb06584e76aa532abd597d1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/210300
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Konstantin Shcheglov
fd2a3cdc3a