Reviewed by Yury Semikhatsky.

        Web Inspector: move node searching and node highlight related methods from InspectorAgent to InspectorDOMAgent.
        https://bugs.webkit.org/show_bug.cgi?id=56912

        The next functions were moved:
            setSearchingForNode
            highlightDOMNode
            hideDOMNodeHighlight
            highlightFrame
            hideFrameHighlight
            mouseDidMoveOverElement
            handleMousePress

        The code which does real highlight in Graphic context was moved to new files DOMNodeHighlighter.*

        * CMakeLists.txt:
        * GNUmakefile.am:
        * WebCore.gypi:
        * WebCore.pro:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * inspector/DOMNodeHighlighter.cpp: Added.
        (WebCore::DOMNodeHighlighter::DrawNodeHighlight):
        * inspector/DOMNodeHighlighter.h: Added.
        * inspector/Inspector.json:
        * inspector/InspectorAgent.cpp:
        (WebCore::InspectorAgent::InspectorAgent):
        (WebCore::InspectorAgent::~InspectorAgent):
        (WebCore::InspectorAgent::inspectedPageDestroyed):
        (WebCore::InspectorAgent::disconnectFrontend):
        * inspector/InspectorAgent.h:
        * inspector/InspectorController.cpp:
        (WebCore::InspectorController::drawNodeHighlight):
        (WebCore::InspectorController::hideHighlight):
        * inspector/InspectorDOMAgent.cpp:
        (WebCore::InspectorDOMAgent::InspectorDOMAgent):
        (WebCore::InspectorDOMAgent::~InspectorDOMAgent):
        (WebCore::InspectorDOMAgent::clearFrontend):
        (WebCore::InspectorDOMAgent::handleMousePress):
        (WebCore::InspectorDOMAgent::mouseDidMoveOverElement):
        (WebCore::InspectorDOMAgent::searchingForNodeInPage):
        (WebCore::InspectorDOMAgent::setSearchingForNode):
        (WebCore::InspectorDOMAgent::highlight):
        (WebCore::InspectorDOMAgent::highlightDOMNode):
        (WebCore::InspectorDOMAgent::highlightFrame):
        (WebCore::InspectorDOMAgent::hideHighlight):
        (WebCore::InspectorDOMAgent::drawNodeHighlight):
        * inspector/InspectorDOMAgent.h:
        (WebCore::InspectorDOMAgent::hideDOMNodeHighlight):
        (WebCore::InspectorDOMAgent::hideFrameHighlight):
        * inspector/InspectorInstrumentation.cpp:
        (WebCore::InspectorInstrumentation::mouseDidMoveOverElementImpl):
        (WebCore::InspectorInstrumentation::handleMousePressImpl):
        * inspector/InstrumentingAgents.h:
        (WebCore::InstrumentingAgents::InstrumentingAgents):
        (WebCore::InstrumentingAgents::inspectorAgent):
        (WebCore::InstrumentingAgents::setInspectorAgent):
        * inspector/front-end/ElementsPanel.js:
        (WebInspector.ElementsPanel.prototype.setSearchingForNode):
        * inspector/front-end/ResourcesPanel.js:
        (WebInspector.FrameTreeElement.prototype.onselect):
        (WebInspector.FrameTreeElement.prototype.set hovered):
        * inspector/front-end/inspector.js:
        (WebInspector.highlightDOMNode):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@81771 268f45cc-cd09-0410-ab3c-d52691b4dbfc