Reviewed by Adam and Maciej.

    Reviewed by Adam and Maciej.

        - Added the IWebScriptScope interface which is used by Drosera to get
        information and run contextually significant code with respect to the
        current JS stack frame.

        * Interfaces/IWebScriptCallFrame.idl: Line endings changed, not sure why
        but the real changes were to change the return type of scopeChain() and
        the return type and name of evaluateWebScript() to
        stringByEvaluatingJavaScriptFromString().
        * Interfaces/IWebScriptScope.idl: Added.
        * WebKit.vcproj/Interfaces.vcproj: Added the new interface.
        * WebKit.vcproj/WebKit.vcproj: Added the files for the new class.
        * WebKit.vcproj/WebKitGUID.vcproj: Added the new interfaces.
        * WebScriptCallFrame.cpp: Changed the return type to E_NOTIMPL and
        asserted so it would be obvious if I accidentally try to use one of
        these functions before it's implemented.
        (WebScriptCallFrame::caller):
        (WebScriptCallFrame::scopeChain):
        (WebScriptCallFrame::functionName):
        (WebScriptCallFrame::stringByEvaluatingJavaScriptFromString):
        * WebScriptCallFrame.h: Changed the return types mentioned above.
        * WebScriptDebugServer.cpp: Also changed the return type to E_NOTIMPL.
        (WebScriptDebugServer::addListener):
        (WebScriptDebugServer::removeListener):
        (WebScriptDebugServer::step):
        (WebScriptDebugServer::pause):
        (WebScriptDebugServer::resume):
        (WebScriptDebugServer::isPaused):
        * WebScriptScope.cpp: Added.
        (WebScriptScope::WebScriptScope):
        (WebScriptScope::~WebScriptScope):
        (WebScriptScope::QueryInterface):
        (WebScriptScope::AddRef):
        (WebScriptScope::Release):
        (WebScriptScope::getVariableNames):
        (WebScriptScope::getValueForVariable):
        * WebScriptScope.h: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@27250 268f45cc-cd09-0410-ab3c-d52691b4dbfc