Moved most of html lib generating scripts into tools.

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

 // 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.
 
 part of indexed_db;
 
 /// @domName $DOMNAME
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   /**
    * @domName IDBKeyRange.only
@@ skipping 16 matching lines @@
   /**
    * @domName KeyRange.bound
    */
   factory KeyRange.bound(/*Key*/ lower, /*Key*/ upper,
                             [bool lowerOpen = false, bool upperOpen = false]) =>
       _KeyRangeFactoryProvider.create$(CLASSNAME)_bound(
           lower, upper, lowerOpen, upperOpen);
 
 $!MEMBERS
 }