Reviewed by Timothy Hatcher.

        Web Inspector: provide custom context menu in the front-end window.

        https://bugs.webkit.org/show_bug.cgi?id=32200

        * English.lproj/localizedStrings.js:
        * GNUmakefile.am:
        * WebCore.gypi:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * bindings/js/JSInspectorFrontendHostCustom.cpp:
        (WebCore::JSInspectorFrontendHost::showContextMenu):
        * inspector/InspectorFrontend.cpp:
        (WebCore::InspectorFrontend::contextMenuItemSelected):
        (WebCore::InspectorFrontend::contextMenuCleared):
        * inspector/InspectorFrontend.h:
        * inspector/InspectorFrontendHost.cpp:
        (WebCore::InspectorFrontendHost::InspectorFrontendHost):
        (WebCore::InspectorFrontendHost::~InspectorFrontendHost):
        (WebCore::InspectorFrontendHost::showContextMenu):
        (WebCore::InspectorFrontendHost::contextMenuItemSelected):
        (WebCore::InspectorFrontendHost::contextMenuCleared):
        * inspector/InspectorFrontendHost.h:
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::create):
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::~MenuSelectionHandler):
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::disconnect):
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::contextMenuItemSelected):
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::contextMenuCleared):
        (WebCore::InspectorFrontendHost::MenuSelectionHandler::MenuSelectionHandler):
        * inspector/InspectorFrontendHost.idl:
        * inspector/front-end/ContextMenu.js: Added.
        * inspector/front-end/WebKit.qrc:
        * inspector/front-end/inspector.html:
        * inspector/front-end/inspector.js:
        (WebInspector.loaded):
        (WebInspector.documentContextMenu):
        * page/ContextMenuController.cpp:
        (WebCore::ContextMenuController::ContextMenuController):
        (WebCore::ContextMenuController::clearContextMenu):
        (WebCore::ContextMenuController::handleContextMenuEvent):
        (WebCore::ContextMenuController::showContextMenu):
        (WebCore::ContextMenuController::createContextMenu):
        (WebCore::ContextMenuController::contextMenuItemSelected):
        * page/ContextMenuController.h:
        * page/ContextMenuSelectionHandler.h: Added.
        (WebCore::ContextMenuSelectionHandler::ContextMenuSelectionHandler):
        (WebCore::ContextMenuSelectionHandler::~ContextMenuSelectionHandler):
        * platform/ContextMenu.cpp:
        (WebCore::ContextMenu::checkOrEnableIfNeeded):
        * platform/ContextMenuItem.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51839 268f45cc-cd09-0410-ab3c-d52691b4dbfc