Big merge from experimental to bleeding edge.

sdk/lib/_internal/compiler/implementation/code_buffer.dart

 // 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 dart2js;
 
 class CodeBuffer implements StringBuffer {
   StringBuffer buffer;
   List<CodeBufferMarker> markers;
   int lastBufferOffset = 0;
@@ skipping 30 matching lines @@
       markers.add(new CodeBufferMarker(offsetDelta,
                                        firstMarker.sourcePosition));
       for (int i = 1; i < other.markers.length; ++i) {
         markers.add(other.markers[i]);
       }
       lastBufferOffset = buffer.length + other.lastBufferOffset;
     }
     buffer.add(other.getText());
   }
 
-  CodeBuffer addAll(Collection<Object> objects) {
-    for (Object obj in objects) {
+  CodeBuffer addAll(Iterable<Object> iterable) {
+    for (Object obj in iterable) {
       add(obj);
     }
     return this;
   }
 
   CodeBuffer addCharCode(int charCode) {
     return add(new String.fromCharCodes([charCode]));
   }
 
   CodeBuffer clear() {
@@ skipping 34 matching lines @@
     });
   }
 }
 
 class CodeBufferMarker {
   final int offsetDelta;
   final sourcePosition;
 
   CodeBufferMarker(this.offsetDelta, this.sourcePosition);
 }