Adding CORS support to HttpRequest

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.
 
 window_open_test: Skip # http://dartbug.com/5151
 async_window_test: Skip #TODO(gram): investigating
 
 event_test: Skip  # Issue 1996
 custom_elements_test: Skip # Not yet implemented.
 interactive_test: Skip # Must be run manually.
@@ skipping 85 matching lines @@
 element_test/click: Fail                # IE does not support firing this event.
 element_test/matches: Fail # IE9 does not support matches
 form_element_test: Fail # Issue 4793.
 isolates_test: Skip         # BUG(4016)
 localstorage_test: Fail
 microtask_test: Pass, Fail # http://dartbug.com/8300
 postmessage_structured_test: Skip   # BUG(5685): times out.
 serialized_script_value_test: Fail
 url_test: Fail              # IE9 does not support createObjectURL (it is supported in IE10)
 window_open_test: Skip      # BUG(4016)
-xhr_cross_origin_test: Fail # Issue 6016.
 canvasrenderingcontext2d_test: Pass, Fail # flaky drawImage. BUG(9189)
 
 # IE9 Feature support statuses-
 # All changes should be accompanied by platform support annotation changes.
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
 cache_test/supported: Fail
 crypto_test/supported: Fail
 css_test/supported_CssMatrix: Fail
 css_test/supported_DomPoint: Fail
@@ skipping 61 matching lines @@
 svgelement_test/supported_feTurbulence: Fail
 svgelement_test/supported_filter: Fail
 svgelement_test/supported_foreignObject: Fail
 svgelement_test/supported_set: Fail
 touchevent_test/supported: Fail
 transition_event_test/supported: Fail
 typed_arrays_1_test/supported: Fail
 webgl_1_test/supported: Fail
 websocket_test/supported: Fail
 websql_test/supported: Fail
+xhr_cross_origin_test/supported: Fail
 xhr_test/supported_HttpRequestProgressEvent: Fail
 xhr_test/supported_onLoadEnd: Fail
 xhr_test/supported_onProgress: Fail
 xsltprocessor_test/supported: Fail
 
 [ $runtime == safari ]
 datalistelement_test: Fail # Issue: 7414
 element_test/elements: Crash, Fail # Issue: 7414
 element_types_test/supported_track: Pass, Fail
 input_element_test/supported_month: Fail, Crash
@@ skipping 130 matching lines @@
 
 [ $compiler == dart2js && $runtime == drt && $unchecked ]
 #indexeddb_5_test/functional: Fail, Pass # http://dartbug.com/8851
 
 [ $compiler == dart2js && $csp && ($runtime == drt || $runtime == safari || $runtime == ff || $runtime == chrome) ]
 js_interop_1_test: Skip            # Test cannot run under CSP restrictions (times out).
 js_interop_2_test: Fail, OK        # Test cannot run under CSP restrictions.
 js_interop_3_test: Skip            # Test cannot run under CSP restrictions (times out).
 postmessage_structured_test: Skip  # Test cannot run under CSP restrictions (times out).
 shadow_dom_layout_test: Fail, OK   # Test cannot run under CSP restrictions.