Adding support checks for FileSystem APIs and making APIs not webkit-specific.

tests/html/html.status

 # Copyright (c) 2012, 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
 
 event_test: Skip  # Issue 1996
 webgl_1_test: Skip  # Issue 1495
 
 # Layout tests are only supported on DRT.
@@ skipping 37 matching lines @@
 document_test/supports_cssCanvasContext: Fail
 element_test/click: Fail                # IE does not support firing this event.
 element_types_test/supported_content: Fail
 element_types_test/supported_details: Fail
 element_types_test/supported_keygen: Fail
 element_types_test/supported_meter: Fail
 element_types_test/supported_object: Fail
 element_types_test/supported_output: Fail
 element_types_test/supported_shadow: Fail
 exceptions_test: Fail
-fileapi_test: Fail
+fileapi_test/supported: Fail
 indexeddb_1_test/supported: Fail         # IE10 does not support from file://
 inner_frame_test: Skip
 input_element_test/supported_date: Fail
 input_element_test/supported_datetime: Fail
 input_element_test/supported_datetime-local: Fail
 input_element_test/supported_month: Fail
 input_element_test/supported_time: Fail
 input_element_test/supported_week: Fail
 isolates_test: Skip
 localstorage_test: Fail
@@ skipping 36 matching lines @@
 # Investigate and triage the following into bug reports.
 #
 audiobuffersourcenode_test: Fail
 audiocontext_test: Fail
 blob_constructor_test: Fail
 cache_test: fail              # IE9 does not support ApplicationCache, but IE 10 does (and should work).
 css_test: Fail
 dom_constructors_test: Fail
 element_test/matches: Fail # IE9 does not support matches
 exceptions_test: Fail
-fileapi_test: Fail          # IE does not support filesystem APIs.
+fileapi_test/supported: Fail
 history_test/supported_state: Fail
 indexeddb_1_test/supported: Fail
 input_element_test/supported_date: Fail
 input_element_test/supported_datetime-local: Fail
 input_element_test/supported_datetime: Fail
 input_element_test/supported_email: Fail
 input_element_test/supported_month: Fail
 input_element_test/supported_number: Fail
 input_element_test/supported_range: Fail
 input_element_test/supported_search: Fail
@@ skipping 28 matching lines @@
 element_types_test/supported_shadow: Fail
 performance_api_test: Fail # window.performance.timing not in Safari 6.
 indexeddb_1_test/supported: Fail
 input_element_test/supported_date: Fail
 input_element_test/supported_datetime: Fail
 input_element_test/supported_datetime-local: Fail
 input_element_test/supported_month: Fail, Crash
 input_element_test/supported_range: Fail, Crash    # TODO(efortuna): Please triage this failure.
 input_element_test/supported_time: Fail, Crash
 input_element_test/supported_week: Fail, Crash
-fileapi_test: Fail # requestFileSystem not supported in Safari 6.
+fileapi_test/supported: Fail
 node_test: Skip # Issue 6457
 shadow_dom_test/supported: Fail
 
 [ $runtime == opera ]
 document_test/supports_cssCanvasContext: Fail
 document_test/document: Fail # Issue: 7413
 form_data_test: Fail # Issue: 7413
 keyboard_event_test: Fail # Issue: 7413
 element_test/eventListening: Fail # Issue: 7413
 element_test/children: Fail # Issue: 7413
@@ skipping 37 matching lines @@
 css_test: Fail               # No analog to WebKitCssMatrix
 dart_object_local_storage_test: Skip  # sessionStorage NS_ERROR_DOM_NOT_SUPPORTED_ERR
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_content: Fail
 element_types_test/supported_details: Fail
 element_types_test/supported_embed: Fail
 element_types_test/supported_keygen: Fail
 element_types_test/supported_shadow: Fail
 element_types_test/supported_track: Fail
 exceptions_test: Fail      # Uses webkitotifications, no analogue in moz
-fileapi_test: Fail         # FF does not support filesystem APIs.
+fileapi_test/supported: Fail
 indexeddb_1_test/supported: Fail  # FF disables indexedDB from file URLs.
 # setup code fails. prepare. (DOM callback has errors) Caught [object Event]
 inner_frame_test: Skip
 input_element_test/supported_date: Fail
 input_element_test/supported_datetime: Fail
 input_element_test/supported_datetime-local: Fail
 input_element_test/supported_month: Fail
 input_element_test/supported_time: Fail
 input_element_test/supported_week: Fail
 input_element_test/supported_number: Fail
@@ skipping 26 matching lines @@
 [ $compiler == dart2js && ($runtime == drt || $runtime == ff) ]
 request_animation_frame_test: Skip # Async test hangs.
 
 [ $compiler == dart2js && ($runtime == drt || $runtime == chrome || $runtime == ff || $runtime == safari) ]
 isolates_test: Skip   # Timeout because leg does not support web workers.
 
 [ $compiler == dart2js && $runtime == ff ]
 xhr_test: Skip # Timeout
 inner_frame_test: Skip # Timeout
 svg_3_test: Skip # Timeout