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On some platforms such as Windows, IME APIs require
native window handle. With this patch set, IME API
wrappers are now able to obtain NativeWindow from
TextInputClient.

BUG=246516,246534

Review URL: https://chromiumcodereview.appspot.com/16154016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204060 0039d316-1c4b-4281-b951-d872f2087c98