Add XFlush calls to fix event injection.
Add XFlush calls to fix event injection.

BUG=None
TEST=Event injection works for remoting_simple_host

Review URL: http://codereview.chromium.org/7029047

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@85848 0039d316-1c4b-4281-b951-d872f2087c98

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