Don't depend on V8 when creating the SDK.

dart/tools/bots/compiler.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
@@ skipping 276 matching lines @@
   # See comment in GetHasHardCodedCheckedMode, this is a hack.
   if (GetHasHardCodedCheckedMode(build_info)):
     TestCompiler(build_info.runtime, build_info.mode, build_info.system,
                  test_flags + ['--checked'], build_info.is_buildbot,
                  build_info.test_set)
 
   if build_info.runtime != 'd8':
     CleanUpTemporaryFiles(build_info.system, build_info.runtime)
 
 
+def BuildCompiler(build_info):
+  """
+  Builds the SDK.
+
+  - build_info: the buildInfo object, containing information about what sort of
+      build and test to be run.
+  """
+  with BuildStep('Build SDK and d8'):
+    args = [sys.executable, './tools/build.py', '--mode=' + build_info.mode,
+            'dart2js_bot']
+    print 'Build SDK and d8: %s' % (' '.join(args))
+    RunProcess(args)
+
+
 if __name__ == '__main__':
-  bot.RunBot(GetBuildInfo, RunCompilerTests)
+  bot.RunBot(GetBuildInfo, RunCompilerTests, build_step=BuildCompiler)