- Include a random number in the full snapshot filename as some of the tests

tools/testing/dart/compiler_configuration.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 compiler_configuration;
 
 import 'dart:io' show
     Platform;
 
 import 'runtime_configuration.dart' show
@@ skipping 387 matching lines @@
     if (isChecked) multiplier *= 2;
     return multiplier;
   }
 
   CommandArtifact computeCompilationArtifact(
       String buildDir,
       String tempDir,
       CommandBuilder commandBuilder,
       List arguments,
       Map<String, String> environmentOverrides) {
+    String outputName = computeOutputName(tempDir);
     return new CommandArtifact(
         <Command>[
             this.computeCompilationCommand(
-                tempDir,
+                outputName,
                 buildDir,
                 CommandBuilder.instance,
                 arguments,
                 environmentOverrides)],
-        computeOutputName(tempDir),
+        outputName,
         'application/dart-snapshot');
   }
 
   String computeOutputName(String tempDir) {
-    return '$tempDir/test.snapshot';
+    var randName = TestUtils.getRandomNumber().toString();
+    return '$tempDir/test.$randName';
   }
 
   CompilationCommand computeCompilationCommand(
-      String tempDir,
+      String outputName,
       String buildDir,
       CommandBuilder commandBuilder,
       List arguments,
       Map<String, String> environmentOverrides) {
     var exec = "$buildDir/dart_no_snapshot";
     var args = new List();
-    args.add("--full-snapshot-after-run=${computeOutputName(tempDir)}");
+    args.add("--full-snapshot-after-run=$outputName");
     args.addAll(arguments);
 
     return commandBuilder.getCompilationCommand(
-        'dart2snapshot', computeOutputName(tempDir), !useSdk,
+        'dart2snapshot', outputName, !useSdk,
         bootstrapDependencies(buildDir),
         exec, args, environmentOverrides);
   }
 
   List<String> computeCompilerArguments(vmOptions,
                                         sharedOptions,
                                         originalArguments) {
     List<String> args = [];
     if (isChecked) {
       args.add('--enable_asserts');
@@ skipping 82 matching lines @@
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
       List<String> originalArguments,
       CommandArtifact artifact) {
     return <String>[];
   }
 }