[M120 Migration][XWalkExtension] Support IME in xwalk exension

[M120 Migration][XWalkExtension] Support IME in xwalk exension

Due to the reason that pepper plugin will be converted to xwalk plugin
Samsung extended IME PPAPI can't be used. Need to provide IME function in
xwalk plugin.
Call Sequence:
(WRT)
sendRuntimeMessage(js) ->
WRTXWalkExtensionBrowserTV::HandleRuntimeMessageInternal ->
SetIMERecommendedWords/SetIMERecommendedWordsType

(HBBTV)
sendRuntimeMessage(js) ->
XWalkExtensionBrowserEfl::HandleRuntimeMessageInternal ->
SetIMERecommendedWords/SetIMERecommendedWordsType

Support SetIMERecommendedWords and SetIMERecommendedWordsType

Migrated from tizen 8.0:
https://review.tizen.org/gerrit/#/c/platform/framework/web/chromium-efl/+/296727/
https://review.tizen.org/gerrit/#/c/platform/framework/web/chromium-efl/+/298681/

Change-Id: I3323c4f4b1800b651d941291930ce2ef65820805
Signed-off-by: jinbei09 <jinbei09.dai@samsung.com>
(cherry picked from commit f567edbefd181c35e2452d9f14b8534b8882c477)