Reviewed by Darin and Alexey.

    Reviewed by Darin and Alexey.

        Fix for <rdar://problem/5231528> Inline input of International text (IME)
                http://bugs.webkit.org/show_bug.cgi?id=14331

        This patch adds IME support to WebKit/win, it currently does not support
        reconversion (<rdar://problem/5334818>) and has issues with the chinese
        IMEs (<rdar://problem/5334826>)

        * WebEditorClient.cpp:
        (WebEditorClient::respondToChangedSelection):
        (WebEditorClient::handleInputMethodKeypress):
          Prevent the initial keydown for an IME from triggering a keypressed event
        * WebView.cpp:
        (WebView::WebView):
        (WebView::keyUp):
        (WebView::keyDown):
        (WebViewWndProc):
        (IMMDict::dict):
        (IMMDict::IMMDict):
           Dynamic loader for IME libraries

        (WebView::getIMMContext):
        (WebView::releaseIMMContext):
        (WebView::prepareCandidateWindow):
        (selectionInsideMarkedText):
        (setSelectionToEndOfRange):
        (WebView::resetIME):
        (WebView::updateSelectionForIME):
        (WebView::selectionChanged):
        (getCompositionString):
        (compositionToUnderlines):
           Helper functions

        (WebView::onIMEStartComposition):
        (WebView::onIMEComposition):
        (WebView::onIMEEndComposition):
        (WebView::onIMEChar):
        (WebView::onIMENotify):
        (WebView::onIMERequest):
        (WebView::onIMESelect):
        (WebView::onIMESetContext):
           IME event handling, so far most of these are not implemented, but the bulk of functionality
           is performed the the composition event handlers
        * WebView.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@24285 268f45cc-cd09-0410-ab3c-d52691b4dbfc