Reviewed by Pavel Feldman.

        Web Inspector: Backend Should Provide Full Supported CSS Properties List
        https://bugs.webkit.org/show_bug.cgi?id=40886

        This allows the backend to send the front-end its complete list of
        supported CSS Properties. This is used in CSS Autocompletion and
        CSS Syntax Highlighting to show which styles are supported.

        * css/makeprop.pl: moved CSS properties to the header file.
        * inspector/Inspector.idl: expose getSupportedCSSProperties.
        * inspector/InspectorDOMAgent.cpp:
        (WebCore::InspectorDOMAgent::getSupportedCSSProperties):
        * inspector/InspectorDOMAgent.h:
        * inspector/front-end/CSSCompletions.js:
        (WebInspector.CSSCompletions._firstIndexOfPrefix): handle a possible error case before properties have loaded.
        (WebInspector.CSSCompletions._load): fill up the special array with the received properties.
        * inspector/front-end/SourceCSSTokenizer.js:
        (WebInspector.SourceCSSTokenizer): use the list of support properties from the backend.
        * inspector/front-end/SourceCSSTokenizer.re2js:
        * inspector/front-end/inspector.js: request the list of supported CSS properties on load.
        (WebInspector.doLoadedDone):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@65942 268f45cc-cd09-0410-ab3c-d52691b4dbfc