Partial support for new getters/setters declaration.

tools/dom/dom.json

 {
   "AbstractWorker": {
     "comment": "http://www.w3.org/TR/workers/#the-abstractworker-abstract-interface",
     "members": {
       "addEventListener": {},
       "dispatchEvent": {},
       "onerror": {},
       "removeEventListener": {}
     },
     "support_level": "stable"
@@ skipping 1068 matching lines @@
       "DOMPoint": {},
       "_DomPoint": {},
       "x": {},
       "y": {}
     },
     "support_level": "nonstandard"
   },
   "DOMSettableTokenList": {
     "comment": "http://dev.w3.org/html5/spec-LC/common-dom-interfaces.html#domsettabletokenlist-0",
     "members": {
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "value": {}
     },
     "support_level": "stable"
   },
   "DOMStringList": {
     "comment": "http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMStringList",
     "members": {
       "contains": {},
       "item": {},
       "length": {}
     },
     "support_level": "stable"
   },
   "DOMStringMap": {
     "comment": "http://dev.w3.org/html5/spec-LC/common-dom-interfaces.html#domstringmap-0",
-    "members": {},
+    "members": {
+      "__getter__": {
+        "support_level": "untriaged"
+      }
+    },
     "support_level": "stable"
   },
   "DOMTokenList": {
     "comment": "http://dev.w3.org/html5/spec-LC/common-dom-interfaces.html#domtokenlist-0",
     "members": {
       "contains": {},
       "item": {},
       "length": {},
       "toString": {},
       "toggle": {}
     },
     "support_level": "stable"
   },
   "DOMWindow": {
     "members": {
       "CSS": {
         "comment": "http://www.w3.org/TR/css3-conditional/#the-css-interface"
       },
       "PERSISTENT": {
         "comment": "http://www.w3.org/TR/file-system-api/#idl-def-LocalFileSystem",
         "support_level": "experimental"
       },
       "TEMPORARY": {
         "comment": "http://www.w3.org/TR/file-system-api/#idl-def-LocalFileSystem",
         "support_level": "experimental"
       },
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "addEventListener": {},
       "alert": {},
       "applicationCache": {},
       "atob": {},
       "blur": {
         "dart_action": "suppress",
         "support_level": "deprecated"
       },
       "btoa": {},
       "cancelAnimationFrame": {},
@@ skipping 2254 matching lines @@
     "members": {
       "color": {},
       "face": {},
       "size": {}
     },
     "support_level": "deprecated"
   },
   "HTMLFormControlsCollection": {
     "comment": "http://www.whatwg.org/specs/web-apps/current-work/multipage/common-dom-interfaces.html#htmlformcontrolscollection-0",
     "members": {
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "namedItem": {}
     },
     "support_level": "stable"
   },
   "HTMLFormElement": {
     "comment": "http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#the-form-element",
     "members": {
       "HTMLFormElement": {},
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "acceptCharset": {},
       "action": {},
       "autocomplete": {
         "comment": "http://www.whatwg.org/specs/web-apps/current-work/multipage/association-of-controls-and-forms.html#autofilling-form-controls:-the-autocomplete-attribute",
         "support_level": "experimental"
       },
       "checkValidity": {},
       "elements": {},
       "encoding": {},
       "enctype": {},
@@ skipping 6678 matching lines @@
       "localService": {},
       "name": {},
       "voiceURI": {}
     },
     "support_level": "experimental"
   },
   "Storage": {
     "comment": "http://www.w3.org/TR/webstorage/#the-storage-interface",
     "dart_action": "unstable",
     "members": {
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "clear": {},
       "getItem": {},
       "key": {},
       "length": {},
       "removeItem": {},
       "setItem": {}
     },
     "support_level": "stable"
   },
   "StorageErrorCallback": {
@@ skipping 1066 matching lines @@
     "comment": "http://www.w3.org/TR/css3-animations/#CSSKeyframeRule-interface",
     "members": {
       "keyText": {},
       "style": {}
     },
     "support_level": "experimental"
   },
   "WebKitCSSKeyframesRule": {
     "comment": "http://www.w3.org/TR/css3-animations/#csskeyframesrule",
     "members": {
+      "__getter__": {
+        "support_level": "untriaged"
+      },
       "cssRules": {},
       "deleteRule": {},
       "findRule": {},
       "insertRule": {},
       "name": {}
     },
     "support_level": "experimental"
   },
   "WebKitCSSMatrix": {
     "comment": "http://dev.w3.org/csswg/cssom/",
@@ skipping 500 matching lines @@
       "importStylesheet": {},
       "removeParameter": {},
       "reset": {},
       "setParameter": {},
       "transformToDocument": {},
       "transformToFragment": {}
     },
     "support_level": "nonstandard"
   }
 }