Dart2js support for custom element lifecycle events

tools/dom/templates/html/impl/impl_Element.darttemplate

Index: tools/dom/templates/html/impl/impl_Element.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_Element.darttemplate b/tools/dom/templates/html/impl/impl_Element.darttemplate
index 8f73476b88f76d38cd1c7ff3a32f1c7ef6fe064b..5732c1ebd5469464a8cdc917a75156394a97d705 100644
--- a/tools/dom/templates/html/impl/impl_Element.darttemplate
+++ b/tools/dom/templates/html/impl/impl_Element.darttemplate
@@ -680,6 +680,20 @@ $(ANNOTATIONS)abstract class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   @Experimental()
   void created() {}

[Jennifer Messerly, 2013/09/20 17:58:35]

should these be called createdCallback to match the spec name?

for better or worse ... Polymer has "createdCallback" and then exposes "created"
itself.

[blois, 2013/09/20 21:39:38]

I'm changing this to createdCallback as a separate CL to make room for the
created constructor, but I think created is the best name for this (and other)
functions.

 
+  /**
+   * Called by the DOM when this element has been inserted into the live
+   * document.
+   */
+  @Experimental()
+  void enteredView() {}
+
+  /**
+   * Called by the DOM when this element has been removed from the live
+   * document.
+   */
+  @Experimental()
+  void leftView() {}
+
   // Hooks to support custom WebComponents.
 
 $if DART2JS