Make it easier and more efficient to use trusted HTML text

CHANGELOG.md

 ## 1.11.0
 
 ### Core library changes
 
+* In `dart:html`, adds `NodeTreeSanitizer.trusted`. This can be used
+  instead of defining a `NullTreeSanitizer` class when calling
+  `setInnerHtml` or other methods that create DOM from text. It is
+  also more efficient, skipping the creation of a DocumentFragment.
 * In `dart:html`, `appendHtml` and `insertAdjacentHtml` now take `nodeValidator`
   and `treeSanitizer` parameters, and the inputs are consistently
   sanitized. See [45818 announcement]
   [45818 announcement](https://groups.google.com/a/dartlang.org/forum/#!topic/announce/GVO7EAcPi6A)
 * List iterators may not throw ConcurrentModificationError as eagerly in
   release mode. In checked mode, the modification check is still as eager
   as possible.
   [r45198](https://code.google.com/p/dart/source/detail?r=45198)
 * `dart:core`
   * Add `unmodifiable` constructor to `List` -
@@ skipping 288 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.