JS tree shaking for incremental builds.

compiler/java/com/google/dart/compiler/backend/js/analysis/TopLevelElementIndexer.java

 // Copyright (c) 2011, 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.
 
 package com.google.dart.compiler.backend.js.analysis;
 
 import org.mozilla.javascript.Token;
 import org.mozilla.javascript.ast.Assignment;
 import org.mozilla.javascript.ast.AstNode;
 import org.mozilla.javascript.ast.ExpressionStatement;
@@ skipping 98 matching lines @@
     for (Entry<String, List<JavascriptElement>> entry : entrySet) {
       System.out.println("--------");
       System.out.println("Name: " + entry.getKey());
       for (JavascriptElement javascriptElement : entry.getValue()) {
         AstNode node = javascriptElement.getNode();
         if (node == null) {
           continue;
         }
 
         System.out.println("Type: " + Token.typeToName(node.getType()));
-        if (javascriptElement.getInherits() != null) {
-          System.out.println("Inherits: " + javascriptElement.getInherits());
+        if (javascriptElement.getInheritsElement() != null) {
+          System.out.println("Inherits: " + javascriptElement.getInheritsElement());
         }
 
         try {
           System.out.println(node.toSource());
         } catch (Exception e) {
           System.out.println("Failed to print node source code");
         }
 
         String name = javascriptElement.getName();
         if (name.endsWith("$named")) {
@@ skipping 46 matching lines @@
       if (expression.getType() == Token.CALL) {
         FunctionCall functionCall = (FunctionCall) expression;
         AstNode target = functionCall.getTarget();
         if (target.getType() == Token.NAME) {
           Name targetName = (Name) target;
           if (RUN_ENTRY_METHOD_NAME.equals(targetName.getIdentifier())) {
             // This is a call to an entry point so add it to the known set of entry points.
             entryPoints.add(node);
             return;
           } else if ("$inherits".equals(targetName.getIdentifier())) {
-            // This is an inheirts call so update the element's inheritance hierarchy.
+            // This is an inherits call so update the element's inheritance hierarchy.
             List<AstNode> arguments = functionCall.getArguments();
             assert (arguments.size() == 2);
             assert (arguments.get(0).getType() == Token.NAME);
             assert (arguments.get(1).getType() == Token.NAME);
             Name subtype = (Name) arguments.get(0);
             Name supertype = (Name) arguments.get(1);
             List<JavascriptElement> subTypeFunctions = namesToElements.get(subtype.getIdentifier());
             assert (subTypeFunctions != null && subTypeFunctions.size() == 1);
             JavascriptElement subtypeFunction = subTypeFunctions.get(0);
             subtypeFunction.setInheritsNode(node);
@@ skipping 76 matching lines @@
         break;
 
       default:
         processGlobal(node);
         break;
     }
 
     return false;
   }
 }