Reviewed by Pavel Feldman.

        Web Inspector: use InstrumentingAgents to access agents from InspectorInstrumentation
        https://bugs.webkit.org/show_bug.cgi?id=60624

        InspectorInstrumentation retrieves inspector agents from corresponding InstrumentingAgents
        instance. Each agent notifies InstrumentingAgents whenever it wants to receive notifications
        about changes in WebCore.

        * inspector/InspectorAgent.cpp:
        (WebCore::InspectorAgent::InspectorAgent):
        (WebCore::InspectorAgent::inspectedPageDestroyed):
        * inspector/InspectorAgent.h:
        * inspector/InspectorConsoleInstrumentation.h:
        (WebCore::InspectorInstrumentation::addMessageToConsole):
        (WebCore::InspectorInstrumentation::consoleCount):
        (WebCore::InspectorInstrumentation::startConsoleTiming):
        (WebCore::InspectorInstrumentation::stopConsoleTiming):
        (WebCore::InspectorInstrumentation::consoleMarkTimeline):
        (WebCore::InspectorInstrumentation::addStartProfilingMessageToConsole):
        (WebCore::InspectorInstrumentation::addProfile):
        (WebCore::InspectorInstrumentation::profilerEnabled):
        (WebCore::InspectorInstrumentation::getCurrentUserInitiatedProfileName):
        * inspector/InspectorController.cpp:
        (WebCore::InspectorController::InspectorController):
        (WebCore::InspectorController::inspectedPageDestroyed):
        (WebCore::InspectorController::didClearWindowObjectInWorld):
        (WebCore::InspectorController::inspectedPage):
        * inspector/InspectorController.h:
        * inspector/InspectorDatabaseInstrumentation.h: FAST_RETURN_IF_NO_FRONTENDS macros
        is used for early return in common case when inspector is not opened. In this
        case inspector instrumentation costs one additional check of a static field.
        (WebCore::InspectorInstrumentation::didOpenDatabase):
        * inspector/InspectorInstrumentation.cpp:
        (WebCore::InspectorInstrumentation::instrumentingAgents):
        (WebCore::InspectorInstrumentation::didClearWindowObjectInWorldImpl):
        (WebCore::InspectorInstrumentation::inspectedPageDestroyedImpl):
        (WebCore::InspectorInstrumentation::willInsertDOMNodeImpl):
        (WebCore::InspectorInstrumentation::didInsertDOMNodeImpl):
        (WebCore::InspectorInstrumentation::willRemoveDOMNodeImpl):
        (WebCore::InspectorInstrumentation::didRemoveDOMNodeImpl):
        (WebCore::InspectorInstrumentation::willModifyDOMAttrImpl):
        (WebCore::InspectorInstrumentation::didModifyDOMAttrImpl):
        (WebCore::InspectorInstrumentation::didInvalidateStyleAttrImpl):
        (WebCore::InspectorInstrumentation::mouseDidMoveOverElementImpl):
        (WebCore::InspectorInstrumentation::handleMousePressImpl):
        (WebCore::InspectorInstrumentation::characterDataModifiedImpl):
        (WebCore::InspectorInstrumentation::willSendXMLHttpRequestImpl):
        (WebCore::InspectorInstrumentation::didScheduleResourceRequestImpl):
        (WebCore::InspectorInstrumentation::didInstallTimerImpl):
        (WebCore::InspectorInstrumentation::didRemoveTimerImpl):
        (WebCore::InspectorInstrumentation::willCallFunctionImpl):
        (WebCore::InspectorInstrumentation::willChangeXHRReadyStateImpl):
        (WebCore::InspectorInstrumentation::willDispatchEventImpl):
        (WebCore::InspectorInstrumentation::willDispatchEventOnWindowImpl):
        (WebCore::InspectorInstrumentation::willEvaluateScriptImpl):
        (WebCore::InspectorInstrumentation::willFireTimerImpl):
        (WebCore::InspectorInstrumentation::willLayoutImpl):
        (WebCore::InspectorInstrumentation::willLoadXHRImpl):
        (WebCore::InspectorInstrumentation::willPaintImpl):
        (WebCore::InspectorInstrumentation::willRecalculateStyleImpl):
        (WebCore::InspectorInstrumentation::applyUserAgentOverrideImpl):
        (WebCore::InspectorInstrumentation::willSendRequestImpl):
        (WebCore::InspectorInstrumentation::continueAfterPingLoaderImpl):
        (WebCore::InspectorInstrumentation::markResourceAsCachedImpl):
        (WebCore::InspectorInstrumentation::didLoadResourceFromMemoryCacheImpl):
        (WebCore::InspectorInstrumentation::willReceiveResourceDataImpl):
        (WebCore::InspectorInstrumentation::willReceiveResourceResponseImpl):
        (WebCore::InspectorInstrumentation::didReceiveResourceResponseImpl):
        (WebCore::InspectorInstrumentation::didReceiveContentLengthImpl):
        (WebCore::InspectorInstrumentation::didFinishLoadingImpl):
        (WebCore::InspectorInstrumentation::didFailLoadingImpl):
        (WebCore::InspectorInstrumentation::resourceRetrievedByXMLHttpRequestImpl):
        (WebCore::InspectorInstrumentation::scriptImportedImpl):
        (WebCore::InspectorInstrumentation::domContentLoadedEventFiredImpl):
        (WebCore::InspectorInstrumentation::loadEventFiredImpl):
        (WebCore::InspectorInstrumentation::frameDetachedFromParentImpl):
        (WebCore::InspectorInstrumentation::didCommitLoadImpl):
        (WebCore::InspectorInstrumentation::willWriteHTMLImpl):
        (WebCore::InspectorInstrumentation::addMessageToConsoleImpl):
        (WebCore::InspectorInstrumentation::consoleCountImpl):
        (WebCore::InspectorInstrumentation::startConsoleTimingImpl):
        (WebCore::InspectorInstrumentation::stopConsoleTimingImpl):
        (WebCore::InspectorInstrumentation::consoleMarkTimelineImpl):
        (WebCore::InspectorInstrumentation::addStartProfilingMessageToConsoleImpl):
        (WebCore::InspectorInstrumentation::addProfileImpl):
        (WebCore::InspectorInstrumentation::getCurrentUserInitiatedProfileNameImpl):
        (WebCore::InspectorInstrumentation::profilerEnabledImpl):
        (WebCore::InspectorInstrumentation::didOpenDatabaseImpl):
        (WebCore::InspectorInstrumentation::didUseDOMStorageImpl):
        (WebCore::InspectorInstrumentation::didStartWorkerContextImpl):
        (WebCore::InspectorInstrumentation::didCreateWorkerImpl):
        (WebCore::InspectorInstrumentation::didDestroyWorkerImpl):
        (WebCore::InspectorInstrumentation::didCreateWebSocketImpl):
        (WebCore::InspectorInstrumentation::willSendWebSocketHandshakeRequestImpl):
        (WebCore::InspectorInstrumentation::didReceiveWebSocketHandshakeResponseImpl):
        (WebCore::InspectorInstrumentation::didCloseWebSocketImpl):
        (WebCore::InspectorInstrumentation::networkStateChangedImpl):
        (WebCore::InspectorInstrumentation::updateApplicationCacheStatusImpl):
        (WebCore::InspectorInstrumentation::hasFrontend):
        (WebCore::InspectorInstrumentation::pauseOnNativeEventIfNeeded):
        (WebCore::InspectorInstrumentation::cancelPauseOnNativeEvent):
        (WebCore::InspectorInstrumentation::retrieveTimelineAgent):
        * inspector/InspectorInstrumentation.h:
        (WebCore::InspectorInstrumentation::bindInstrumentingAgents):
        (WebCore::InspectorInstrumentation::unbindInstrumentingAgents):
        (WebCore::InspectorInstrumentation::didClearWindowObjectInWorld):
        (WebCore::InspectorInstrumentation::inspectedPageDestroyed):
        (WebCore::InspectorInstrumentation::willInsertDOMNode):
        (WebCore::InspectorInstrumentation::didInsertDOMNode):
        (WebCore::InspectorInstrumentation::willRemoveDOMNode):
        (WebCore::InspectorInstrumentation::willModifyDOMAttr):
        (WebCore::InspectorInstrumentation::didModifyDOMAttr):
        (WebCore::InspectorInstrumentation::didInvalidateStyleAttr):
        (WebCore::InspectorInstrumentation::mouseDidMoveOverElement):
        (WebCore::InspectorInstrumentation::handleMousePress):
        (WebCore::InspectorInstrumentation::characterDataModified):
        (WebCore::InspectorInstrumentation::willSendXMLHttpRequest):
        (WebCore::InspectorInstrumentation::didScheduleResourceRequest):
        (WebCore::InspectorInstrumentation::didInstallTimer):
        (WebCore::InspectorInstrumentation::didRemoveTimer):
        (WebCore::InspectorInstrumentation::willCallFunction):
        (WebCore::InspectorInstrumentation::willChangeXHRReadyState):
        (WebCore::InspectorInstrumentation::willDispatchEvent):
        (WebCore::InspectorInstrumentation::willDispatchEventOnWindow):
        (WebCore::InspectorInstrumentation::willEvaluateScript):
        (WebCore::InspectorInstrumentation::willFireTimer):
        (WebCore::InspectorInstrumentation::willLayout):
        (WebCore::InspectorInstrumentation::willLoadXHR):
        (WebCore::InspectorInstrumentation::willPaint):
        (WebCore::InspectorInstrumentation::willRecalculateStyle):
        (WebCore::InspectorInstrumentation::applyUserAgentOverride):
        (WebCore::InspectorInstrumentation::willSendRequest):
        (WebCore::InspectorInstrumentation::continueAfterPingLoader):
        (WebCore::InspectorInstrumentation::markResourceAsCached):
        (WebCore::InspectorInstrumentation::didLoadResourceFromMemoryCache):
        (WebCore::InspectorInstrumentation::willReceiveResourceData):
        (WebCore::InspectorInstrumentation::willReceiveResourceResponse):
        (WebCore::InspectorInstrumentation::continueAfterXFrameOptionsDenied):
        (WebCore::InspectorInstrumentation::continueWithPolicyDownload):
        (WebCore::InspectorInstrumentation::continueWithPolicyIgnore):
        (WebCore::InspectorInstrumentation::didReceiveContentLength):
        (WebCore::InspectorInstrumentation::didFinishLoading):
        (WebCore::InspectorInstrumentation::didFailLoading):
        (WebCore::InspectorInstrumentation::resourceRetrievedByXMLHttpRequest):
        (WebCore::InspectorInstrumentation::scriptImported):
        (WebCore::InspectorInstrumentation::domContentLoadedEventFired):
        (WebCore::InspectorInstrumentation::loadEventFired):
        (WebCore::InspectorInstrumentation::frameDetachedFromParent):
        (WebCore::InspectorInstrumentation::didCommitLoad):
        (WebCore::InspectorInstrumentation::willWriteHTML):
        (WebCore::InspectorInstrumentation::didUseDOMStorage):
        (WebCore::InspectorInstrumentation::willStartWorkerContext):
        (WebCore::InspectorInstrumentation::didStartWorkerContext):
        (WebCore::InspectorInstrumentation::didCreateWorker):
        (WebCore::InspectorInstrumentation::didDestroyWorker):
        (WebCore::InspectorInstrumentation::didCreateWebSocket):
        (WebCore::InspectorInstrumentation::willSendWebSocketHandshakeRequest):
        (WebCore::InspectorInstrumentation::didReceiveWebSocketHandshakeResponse):
        (WebCore::InspectorInstrumentation::didCloseWebSocket):
        (WebCore::InspectorInstrumentation::networkStateChanged):
        (WebCore::InspectorInstrumentation::updateApplicationCacheStatus):
        (WebCore::InspectorInstrumentation::hasFrontend):
        (WebCore::InspectorInstrumentation::instrumentingAgentsForContext):
        (WebCore::InspectorInstrumentation::instrumentingAgentsForPage):
        (WebCore::InspectorInstrumentation::instrumentingAgentsForFrame):
        (WebCore::InspectorInstrumentation::instrumentingAgentsWithFrontendForFrame):
        (WebCore::InspectorInstrumentation::instrumentingAgentsWithFrontendForPage):
        (WebCore::InspectorInstrumentation::instrumentingAgentsWithFrontendForContext):
        (WebCore::InspectorInstrumentation::instrumentingAgentsWithFrontendForDocument):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@86564 268f45cc-cd09-0410-ab3c-d52691b4dbfc