Fix the build: we must still not mangle parameter names of native methods.

sdk/lib/_internal/compiler/implementation/ssa/variable_allocator.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 ssa;
 
 /**
  * The [LiveRange] class covers a range where an instruction is live.
  */
 class LiveRange {
@@ skipping 493 matching lines @@
       // Special case this instruction to use the name of its
       // input if it has one.
       var temp = instruction;
       do {
         temp = temp.checkedInput;
         name = names.ownName[temp];
       } while (name == null && temp is HCheck);
       if (name != null) return addAllocatedName(instruction, name);
     }
 
-    if (instruction.sourceElement != null) {
+    // The dom/html libraries have inline JS code that reference        

[floitsch, 2012/11/07 16:44:30]

remove tab.

+    // parameter names directly. Long-term such code will be rejected.
+    // Now, just don't mangle the parameter name.
+    if (instruction is HParameterValue
+        && instruction.sourceElement.enclosingElement.isNative()) {
+      name = instruction.sourceElement.name.slowToString();
+    } else if (instruction.sourceElement != null) {
       name = allocateWithHint(instruction.sourceElement.name.slowToString());
     } else {
       // We could not find an element for the instruction. If the
       // instruction is used by a phi, try to use the name of the phi.
       // Otherwise, just allocate a temporary name.
       HPhi phi = firstPhiUserWithElement(instruction);
       if (phi != null) {
         name = allocateWithHint(phi.sourceElement.name.slowToString());
       } else {
         name = allocateTemporary();
@@ skipping 144 matching lines @@
       if (!needsName(input)) {
         names.addAssignment(predecessor, input, phi);
       } else {
         names.addCopy(predecessor, input, phi);
       }
     }
 
     namer.allocateName(phi);
   }
 }