Re-implement the status page for the new task model

pkg/analyzer/lib/src/generated/engine.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine;
 
 import 'dart:async';
@@ skipping 2621 matching lines @@
       buffer.writeln(" removed");
       for (Source source in missingSources) {
         buffer.write("    ");
         buffer.writeln(source.fullName);
       }
       _logInformation(buffer.toString());
     }
     return changedSources.length > 0;
   }
 
+  @deprecated
   @override
   void visitCacheItems(void callback(Source source, SourceEntry dartEntry,
       DataDescriptor rowDesc, CacheState state)) {
     bool hintsEnabled = _options.hint;
     bool lintsEnabled = _options.lint;
     MapIterator<Source, SourceEntry> iterator = _cache.iterator();
     while (iterator.moveNext()) {
       Source source = iterator.key;
       SourceEntry sourceEntry = iterator.value;
       for (DataDescriptor descriptor in sourceEntry.descriptors) {
@@ skipping 43 matching lines @@
               continue;
             }
             callback(librarySource, sourceEntry, descriptor,
                 sourceEntry.getStateInLibrary(descriptor, librarySource));
           }
         }
       }
     }
   }
 
-  /**
-   * Visit all entries of the content cache.
-   */
+  @override
   void visitContentCache(ContentCacheVisitor visitor) {
     _contentCache.accept(visitor);
   }
 
   /**
    * Record that we have accessed the AST structure associated with the given
    * [source]. At the moment, there is no differentiation between the parsed and
    * resolved forms of the AST.
    */
   void _accessedAst(Source source) {
@@ skipping 6612 matching lines @@
 
   /**
    * For testing only: flush all representations of the AST (both resolved and
    * unresolved) for the given [source] out of the cache.
    */
   void test_flushAstStructures(Source source);
 
   /**
    * Call the given callback function for eache cache item in the context.
    */
+  @deprecated
   void visitCacheItems(void callback(Source source, SourceEntry dartEntry,
       DataDescriptor rowDesc, CacheState state));
+
+  /**
+   * Visit all entries of the content cache.
+   */
+  void visitContentCache(ContentCacheVisitor visitor);
 }
 
 /**
  * An object that can be used to receive information about errors within the
  * analysis engine. Implementations usually write this information to a file,
  * but can also record the information for later use (such as during testing) or
  * even ignore the information.
  */
 abstract class Logger {
   /**
@@ skipping 2510 matching lines @@
     PendingFuture pendingFuture =
         new PendingFuture<T>(_context, source, computeValue);
     if (!pendingFuture.evaluate(sourceEntry)) {
       _context._pendingFutureSources
           .putIfAbsent(source, () => <PendingFuture>[])
           .add(pendingFuture);
     }
     return pendingFuture.future;
   }
 }