[BlackBerry] Add WebPage interface for Async spell check.

[BlackBerry] Add WebPage interface for Async spell check.
https://bugs.webkit.org/show_bug.cgi?id=89999

Reviewed by Rob Buis.

PR 124517.

Add interface for IMS async spell checking.

Reviewed Internally by Nima Ghanavatian.

* Api/WebPage.cpp:
(BlackBerry::WebKit::WebPage::spellCheckingRequestProcessed):
(WebKit):
* Api/WebPage.h:
* Api/WebPageClient.h:
* WebKitSupport/InputHandler.cpp:
(WebKit):
(BlackBerry::WebKit::InputHandler::spellCheckingRequestProcessed):
* WebKitSupport/InputHandler.h:
(InputHandler):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121281 268f45cc-cd09-0410-ab3c-d52691b4dbfc