Merge 266651 "linux-aura: Supports Compose key with XIM."

> linux-aura: Supports Compose key with XIM.
> 
> Supports Compose key with XIM and makes .XCompose settings effective with Linux Aura build.
> 
> BUG=351230,360388,349163
> TEST=Done manually.  Tested with GTK_IM_MODULE=xim XMODIFIERS=@im=none and ~/.XCompose with custom contents.
> R=erg@chromium.org, sadrul@chromium.org
> 
> Review URL: https://codereview.chromium.org/243143002

TBR=piman@chromium.org,yukishiino@chromium.org

Review URL: https://codereview.chromium.org/260573002

git-svn-id: svn://svn.chromium.org/chrome/branches/1916/src@266967 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed