Allow matchingTarget to also include the currentTarget.

sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 7d5d233479d2842d0b99f5a4f6a3d0fb36d87fab..34d5da9a34fa3b208ff827a02edce207f7c57921 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -10962,13 +10962,11 @@ class Event extends NativeFieldWrapperClass2 {
     var currentTarget = this.currentTarget;
     var target = this.target;
     var matchedTarget;
-    while (matchedTarget == null && target != currentTarget && target != null) {
-      if (target.matches(_selector)) {
-        matchedTarget = target;
-      }
+    do {
+      if (target.matches(_selector)) return target;
       target = target.parent;
-    }
-    return matchedTarget;
+    } while (target != null && target != currentTarget.parent);
+    throw new StateError('No selector matched for populating matchedTarget.');
   }
   // To suppress missing implicit constructor warnings.
   factory Event._() { throw new UnsupportedError("Not supported"); }
@@ -34378,6 +34376,13 @@ final _pureIsolatePrintClosure = (s) {
 
 final _forwardingPrintClosure = _Utils.forwardingPrint;
 
+final _uriBaseClosure = () => Uri.parse(window.location.href);
+
+final _pureIsolateUriBaseClosure = () {
+  throw new UnimplementedError("Uri.base on a background isolate "
+                               "is not supported in the browser");
+};
+
  class _Timer implements Timer {
   var _canceler;