GitLab

Add switch "--enable-inputmethod-ibus" to enable InputMethodIBus on ChromeOS
Modify gyp files to link IBus

BUG=chromium-os:15566
TEST=manually

Review URL: http://codereview.chromium.org/7004029

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86390 0039d316-1c4b-4281-b951-d872f2087c98