Makes HandleWatcher block until no longer waiting on pipe

BUG=394886
TEST=covered as best as can from tests
R=darin@chromium.org, jam@chromium.org

Review URL: https://codereview.chromium.org/409943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285266 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: c902c5745c3a69afd98cc856b79aea7251de19ea
8 files changed
tree: 26be9c8e84a24de7c5539c664557b9f82f8160a1
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/