Update CHANGELOG.md with AOT

Closes #36794
#36794

GitOrigin-RevId: 3e266b8
Change-Id: If99bd3c60a1777de4f7bff6ef5463802ccf1c60d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/100720
Commit-Queue: Kathy Walrath <[email protected]>
Reviewed-by: Clement Skau <[email protected]>

Author: mit-mit

CHANGELOG.md

@@ -259,6 +259,16 @@ The Linter was updated to `0.1.86`, which includes the following changes:
 *   Added support for `pub global activate`ing package from a custom pub URL.
 *   Added subcommand: `pub logout`. Logs you out of the current session.
 
+#### Dart native
+
+Initial support for compiling Dart apps to native machine code has been added.
+Two new tools have been added to the `bin` folder of the Dart SDK:
+
+* `dart2aot`: AOT (ahead-of-time) compiles a Dart program to native
+machine code. The tool is supported on Windows, macOS, and Linux.
+
+* `dartaotruntime`: A small runtime used for executing an AOT compiled program.
+
 ## 2.2.0 - 2019-02-26
 
 ### Language