Support user generated custom native JS classes.

tests/html/html.status

 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 interactive_test: Skip # Must be run manually.
 dromaeo_smoke_test: Skip # Issue 14521, 8257
 cross_frame_test: Skip # Test reloads itself. Issue 18558
 
-js_array_test: Skip # Issue 23676, 23677
-js_typed_interop_test: Skip # Issue 23676, 23677
+[ $compiler == none && ($runtime == dartium || $runtime == drt) ]
 
-[ $compiler == none && ($runtime == dartium || $runtime == drt) ]
+js_array_test: Skip # Dartium JSInterop failure
+js_typed_interop_test: Skip # Dartium JSInterop failure
+mirrors_js_typed_interop_test: Skip # Dartium JSInterop failure
+
 cross_domain_iframe_test: RuntimeError # Dartium JSInterop failure
 custom/document_register_type_extensions_test/registration: RuntimeError # Dartium JSInterop failure
 custom/element_upgrade_test: RuntimeError # Dartium JSInterop failure
 indexeddb_2_test: Skip # Dartium JSInterop failure
 js_test/transferrables: RuntimeError # Dartium JSInterop failure
 js_test/JsArray: RuntimeError # Dartium JSInterop failure
 native_gc_test: Skip # Dartium JSInterop failure
 storage_quota_test/missingenumcheck: RuntimeError # Dartium JSInterop failure
 storage_quota_test/none: RuntimeError # Dartium JSInterop failure
 transferables_test: RuntimeError # Dartium JSInterop failure
@@ skipping 355 matching lines @@
 # 'html' tests import the HTML library, so they only make sense in
 # a browser environment.
 [ $runtime == vm ]
 *: Skip
 
 [ $compiler == dart2js && ($runtime == drt || $runtime == ff) ]
 request_animation_frame_test: Skip # Async test hangs.
 
 [ $compiler == dart2js && $csp && ($runtime == drt || $runtime == safari || $runtime == ff || $runtime == chrome || $runtime == chromeOnAndroid) ]
 # Note: these tests are all injecting scripts by design.  This is not allowed under CSP.
-event_customevent_test: Fail       # Test cannot run under CSP restrictions.
-js_interop_1_test: Skip            # Test cannot run under CSP restrictions (times out).
-js_test: Skip                      # Test cannot run under CSP restrictions (times out).
-postmessage_structured_test: Skip  # Test cannot run under CSP restrictions (times out).
+event_customevent_test: Fail        # Test cannot run under CSP restrictions.
+js_interop_1_test: Skip             # Test cannot run under CSP restrictions (times out).
+js_test: Skip                       # Test cannot run under CSP restrictions (times out).
+js_array_test: Skip                 # Test cannot run under CSP restrictions.
+js_typed_interop_test: Skip         # Test cannot run under CSP restrictions.
+js_dart_to_string_test: Skip        # Test cannot run under CSP restrictions.
+mirrors_js_typed_interop_test: Skip # Test cannot run under CSP restrictions.
+postmessage_structured_test: Skip   # Test cannot run under CSP restrictions (times out).
 
 [ $compiler == dart2js &&  $runtime == chrome]
 svgelement_test/supported_altGlyph: RuntimeError # Issue 23144
 
 [ ($runtime == dartium) && ($system == macos || $system == windows || $system == linux)]
 # Desktop operating systems do not support touch events on chrome 34 dartium.
 touchevent_test/supported: Fail
 
 [ (($runtime == dartium || $runtime == drt) && $system == macos) || $system == windows ]
 xhr_test/xhr: Skip # Times out.  Issue 21527
@@ skipping 12 matching lines @@
 queryall_test: fail
 track_element_constructor_test: StaticWarning
 transferables_test: StaticWarning
 typed_arrays_range_checks_test: StaticWarning
 typing_test: StaticWarning
 webgl_1_test: StaticWarning
 window_nosuchmethod_test: StaticWarning
 
 [ $compiler == dart2js && $cps_ir ]
 resource_http_test: Crash # (await for(var b in r.openRead()){bytes.addAll(b);}): await for