Add support for integration builds in annotated steps

Trying to address the failures here:  http://chromegw.corp.google.com/i/client.dart/builders/dartium-mac-inc-integration/builds/2/steps/annotated_steps/logs/stdio

TBR=jacobr@google.com,ricow@google.com

Review URL: https://codereview.chromium.org/195053005

git-svn-id: svn://svn.chromium.org/chrome/branches/dart/1750/src@256290 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed