GitLab

Initialize/Shutdown IBusBridge on input method initialization/shutting down.

IBusBridge is only used for ChromeOS-Chrome on Desktop Linux.

BUG=170671
TEST=try bots.

Review URL: https://chromiumcodereview.appspot.com/12221045

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182098 0039d316-1c4b-4281-b951-d872f2087c98