SDK gets analyzer sources.
SDK gets analyzer sources.

With this change, analyzer and server sources will appear in `sdk/lib`.

Having the sources in the SDK is a prerequisite to consuming them in a spawned Isolate (needed for dynamic analyzer plugin loading).

R=brianwilkerson@google.com, whesse@google.com

Review URL: https://codereview.chromium.org/1601373002 .

dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk