Merging dart:html interfaces and implementations

sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate

Index: sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate
diff --git a/sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate b/sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate
index 1119e937d70786fc79a6404ecd7b309a9e5ff1c4..0ce4dcf371717131ac629b5d44b24fcb3a316702 100644
--- a/sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate
+++ b/sdk/lib/html/templates/html/dartium/impl_LocalWindow.darttemplate
@@ -4,16 +4,29 @@
 
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
+  /**
+   * Executes a [callback] after the next batch of browser layout measurements
+   * has completed or would have completed if any browser layout measurements
+   * had been scheduled.
+   */
   void requestLayoutFrame(TimeoutHandler callback) {
     _addMeasurementFrameCallback(callback);
   }
 
-  // TODO(kasperl): Document these.
+  /**
+   * Lookup a port by its [name].  Return null if no port is
+   * registered under [name].
+   */
   lookupPort(String name) {
     var port = JSON.parse(localStorage['dart-port:$name']);
     return _deserialize(port);
   }
 
+  /**
+   * Register a [port] on this window under the given [name].  This
+   * port may be retrieved by any isolate (or JavaScript script)
+   * running in this window.
+   */
   registerPort(String name, var port) {
     var serialized = _serialize(port);
     localStorage['dart-port:$name'] = JSON.stringify(serialized);