Reapply 169371 "DevTools: defer styles delta calculation to until the end of the task"

Source/core/inspector/InspectorController.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 410 matching lines @@
 void InspectorController::didProcessTask()
 {
     if (InspectorTimelineAgent* timelineAgent = m_instrumentingAgents->inspectorTimelineAgent())
         timelineAgent->didProcessTask();
     if (InspectorProfilerAgent* profilerAgent = m_instrumentingAgents->inspectorProfilerAgent())
         profilerAgent->didProcessTask();
     if (InspectorDOMDebuggerAgent* domDebuggerAgent = m_instrumentingAgents->inspectorDOMDebuggerAgent())
         domDebuggerAgent->didProcessTask();
 }
 
+void InspectorController::flushPendingFrontendMessages()
+{
+    m_agents.flushPendingFrontendMessages();
+}
+
 void InspectorController::didCommitLoadForMainFrame()
 {
     Vector<InspectorAgent*> agents = m_moduleAgents;
     for (size_t i = 0; i < agents.size(); i++)
         agents[i]->didCommitLoadForMainFrame();
 }
 
 void InspectorController::didBeginFrame(int frameId)
 {
     if (InspectorTimelineAgent* timelineAgent = m_instrumentingAgents->inspectorTimelineAgent())
@@ skipping 38 matching lines @@
         m_layerTreeAgent->willAddPageOverlay(layer);
 }
 
 void InspectorController::didRemovePageOverlay(const GraphicsLayer* layer)
 {
     if (m_layerTreeAgent)
         m_layerTreeAgent->didRemovePageOverlay(layer);
 }
 
 } // namespace WebCore