Bug 924682 - [Pure] getters for some often used attributes, r=bz

--HG--
extra : rebase_source : b77cb6514838e6f3489896eda905622e345fff9e

dom/webidl/CharacterData.webidl

@@ -11,7 +11,9 @@
  */
 
 interface CharacterData : Node {
-  [TreatNullAs=EmptyString,SetterThrows] attribute DOMString data;
+  [TreatNullAs=EmptyString, Pure, SetterThrows]
+  attribute DOMString data;
+  [Pure]
   readonly attribute unsigned long length;
   [Throws]
   DOMString substringData(unsigned long offset, unsigned long count);

dom/webidl/Event.webidl

@@ -12,26 +12,34 @@
 
 [Constructor(DOMString type, optional EventInit eventInitDict)]
 interface Event {
+  [Pure]
   readonly attribute DOMString type;
+  [Pure]
   readonly attribute EventTarget? target;
+  [Pure]
   readonly attribute EventTarget? currentTarget;
 
   const unsigned short NONE = 0;
   const unsigned short CAPTURING_PHASE = 1;
   const unsigned short AT_TARGET = 2;
   const unsigned short BUBBLING_PHASE = 3;
+  [Pure]
   readonly attribute unsigned short eventPhase;
 
   void stopPropagation();
   void stopImmediatePropagation();
 
+  [Pure]
   readonly attribute boolean bubbles;
+  [Pure]
   readonly attribute boolean cancelable;
   void preventDefault();
+  [Pure]
   readonly attribute boolean defaultPrevented;
 
-  [Unforgeable]
+  [Unforgeable, Pure]
   readonly attribute boolean isTrusted;
+  [Pure]
   readonly attribute DOMTimeStamp timeStamp;
 
   [Throws]

dom/webidl/HTMLDocument.webidl

@@ -15,14 +15,21 @@ interface HTMLDocument : Document {
   // DOM tree accessors
   [Throws]
   getter object (DOMString name);
-           [SetterThrows]
+  [Pure, SetterThrows]
            attribute HTMLElement? body;
+  [Pure]
   readonly attribute HTMLHeadElement? head;
+  [Pure]
   readonly attribute HTMLCollection images;
+  [Pure]
   readonly attribute HTMLCollection embeds;
+  [Pure]
   readonly attribute HTMLCollection plugins;
+  [Pure]
   readonly attribute HTMLCollection links;
+  [Pure]
   readonly attribute HTMLCollection forms;
+  [Pure]
   readonly attribute HTMLCollection scripts;
   NodeList getElementsByName(DOMString elementName);
   NodeList getItems(optional DOMString typeNames = ""); // microdata
@@ -60,7 +67,9 @@ interface HTMLDocument : Document {
   [TreatNullAs=EmptyString] attribute DOMString alinkColor;
   [TreatNullAs=EmptyString] attribute DOMString bgColor;
 
+  [Pure]
   readonly attribute HTMLCollection anchors;
+  [Pure]
   readonly attribute HTMLCollection applets;
 
   void clear();