Simplify how patch files are specified to analyzer.

pkg/analyzer/test/generated/engine_test.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.
 
 library analyzer.test.generated.engine_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 40 matching lines @@
     modifiedOptions.excludePatterns = ['a'];
     modifiedOptions.finerGrainedInvalidation = true;
     modifiedOptions.generateImplicitErrors = false;
     modifiedOptions.generateSdkErrors = true;
     modifiedOptions.hint = false;
     modifiedOptions.incremental = true;
     modifiedOptions.incrementalApi = true;
     modifiedOptions.incrementalValidation = true;
     modifiedOptions.lint = true;
     modifiedOptions.lintRules = [null];
-    modifiedOptions.patchPlatform = 3;
+    modifiedOptions.patchPaths = {
+      'dart:core': ['/dart_core.patch.dart']
+    };
     modifiedOptions.preserveComments = false;
     modifiedOptions.strongMode = true;
     modifiedOptions.trackCacheDependencies = false;
 
     modifiedOptions.resetToDefaults();
 
     expect(modifiedOptions.dart2jsHint, defaultOptions.dart2jsHint);
     expect(modifiedOptions.disableCacheFlushing,
         defaultOptions.disableCacheFlushing);
     expect(modifiedOptions.enableAssertInitializer,
@@ skipping 12 matching lines @@
     expect(modifiedOptions.generateImplicitErrors,
         defaultOptions.generateImplicitErrors);
     expect(modifiedOptions.generateSdkErrors, defaultOptions.generateSdkErrors);
     expect(modifiedOptions.hint, defaultOptions.hint);
     expect(modifiedOptions.incremental, defaultOptions.incremental);
     expect(modifiedOptions.incrementalApi, defaultOptions.incrementalApi);
     expect(modifiedOptions.incrementalValidation,
         defaultOptions.incrementalValidation);
     expect(modifiedOptions.lint, defaultOptions.lint);
     expect(modifiedOptions.lintRules, defaultOptions.lintRules);
-    expect(modifiedOptions.patchPlatform, defaultOptions.patchPlatform);
+    expect(modifiedOptions.patchPaths, defaultOptions.patchPaths);
     expect(modifiedOptions.preserveComments, defaultOptions.preserveComments);
     expect(modifiedOptions.strongMode, defaultOptions.strongMode);
     expect(modifiedOptions.trackCacheDependencies,
         defaultOptions.trackCacheDependencies);
   }
 }
 
 /**
  * A listener used to gather the [ImplicitAnalysisEvent]s that are produced
  * during analysis.
@@ skipping 668 matching lines @@
   @override
   void test_flushAstStructures(Source source) {
     fail("Unexpected invocation of test_flushAstStructures");
   }
 
   @override
   void visitContentCache(ContentCacheVisitor visitor) {
     fail("Unexpected invocation of visitContentCache");
   }
 }