Split core file tracking functionality from AnalysisDriver.

pkg/analyzer/test/src/dart/analysis/driver_test.dart

 // Copyright (c) 2016, 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.
 
 library analyzer.test.driver;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 432 matching lines @@
       AnalysisResult ar = allResults.firstWhere((r) => r.path == a);
       expect(_getTopLevelVarType(ar.unit, 'A'), 'int');
     }
     allResults.clear();
 
     // Change "b" and notify.
     provider.updateFile(b, 'var B = 1.2;');
     driver.changeFile(b);
 
     // "b" is not an added file, so it is not scheduled for analysis.
-    expect(driver.test.filesToAnalyze, isEmpty);
+    expect(driver.test.fileTracker.hasPendingFiles, isFalse);
 
     // While "b" is not analyzed explicitly, it is analyzed implicitly.
     // The change causes "a" to be reanalyzed.
     await scheduler.waitForIdle();
     expect(allResults, hasLength(1));
     {
       AnalysisResult ar = allResults.firstWhere((r) => r.path == a);
       expect(_getTopLevelVarType(ar.unit, 'A'), 'double');
     }
   }
@@ skipping 97 matching lines @@
     provider.updateFile(testFile, 'var V = 1.2');
 
     // No new results.
     await pumpEventQueue();
     expect(allResults, isEmpty);
 
     // Notify the driver about the change.
     driver.changeFile(testFile);
 
     // The file was added, so it is scheduled for analysis.
-    expect(driver.test.filesToAnalyze, contains(testFile));
+    expect(driver.test.fileTracker.isFilePending(testFile), isTrue);
 
     // We get a new result.
     {
       await scheduler.waitForIdle();
       expect(allResults, hasLength(1));
       AnalysisResult result = allResults[0];
       expect(result.path, testFile);
       expect(_getTopLevelVarType(result.unit, 'V'), 'double');
     }
   }
@@ skipping 1469 matching lines @@
    * Return the [provider] specific path for the given Posix [path].
    */
   String _p(String path) => provider.convertPath(path);
 
   static String _md5(String content) {
     return hex.encode(md5.convert(UTF8.encode(content)).bytes);
   }
 }
 
 class _SourceMock extends TypedMock implements Source {}