tree 211c7e668c1d86db121cdb95f6bd2a69fc0c9567
parent 4d770b0e09aa7d92c4ceaa607d9a5e8c314c377b
author Zach Anderson <zra@google.com> 1555975872 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1555975872 +0000

[flutter_runner] Use a custom wrapper (RunnerContext) for startup handles

In the singleton app case, this is a prerequisite to Dart code
exposing stuff under out/.

Change-Id: Id581f1280abe9ef808584e0d14ff7d18f290d212