GitLab

Currently CancelCompositionText is not fully implemented in
InputMethodTSF. This CL fixes the issue.

Note:
CUAS is also implementing the protocol conversions from
  ImmNotifyIME(NI_COMPOSITIONSTR, CPS_CANCEL, 0)
and
  ImmNotifyIME(NI_COMPOSITIONSTR, CPS_COMPLETE, 0)
into TSF operations, respectively. To minimize the risk of
compatibility issues, this CL uses the the same protocol
conversions logic to CUAS.

BUG=246534
TEST=Tested with GoogleJapaneseInput

Review URL: https://chromiumcodereview.appspot.com/16901011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208124 0039d316-1c4b-4281-b951-d872f2087c98