Add support for analyzing individual URIs.

tests/compiler/dart2js/incremental/compile_all.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.
 
 // Helper file that can be used to manually test the stability of incremental
 // compilation.  Currently this test is not run automatically.
 
 import 'dart:async';
 
 import 'dart:io';
@@ skipping 25 matching lines @@
   }
   sw.stop();
   print(sw.elapsedMilliseconds);
   compileTests(sources);
 }
 
 void compileTests(Map<String, String> sources) {
   int testCount = 0;
   int skipCount = 0;
   Set<String> crashes = new Set<String>();
-  Compiler memoryCompiler = compilerFor(sources);
+  Compiler memoryCompiler = compilerFor(memorySourceFiles: sources);
   FormattingDiagnosticHandler handler = memoryCompiler.handler;
   handler.verbose = verbose;
   var options = ['--analyze-main'];
   if (true || verbose) options.add('--verbose');
   IncrementalCompiler compiler = new IncrementalCompiler(
       libraryRoot: memoryCompiler.libraryRoot,
       inputProvider: memoryCompiler.provider,
       outputProvider: memoryCompiler.userOutputProvider,
       diagnosticHandler: memoryCompiler.handler,
       packageRoot: memoryCompiler.packageRoot,
@@ skipping 112 matching lines @@
     "/language/setter_declaration2_negative_test.dart",
     "/language/source_self_negative_test.dart",
     "/language/syntax_test.dart",
     "/language/type_variable_bounds2_test.dart",
     "/language/type_variable_conflict2_test.dart",
     "/language/type_variable_field_initializer_test.dart",
     "/language/type_variable_nested_test.dart",
     "/language/vm/reflect_core_vm_test.dart",
     "/language/vm/regress_14903_test.dart",
 ]);