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

Source/web/WebDevToolsAgentImpl.cpp

 /*
  * Copyright (C) 2010-2011 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 99 matching lines @@
         : m_running(false)
         , m_messageLoop(messageLoop) { }
 
 
     virtual void run(Page* page)
     {
         if (m_running)
             return;
         m_running = true;
 
+        // 0. Flush pending frontend messages.
+        WebViewImpl* viewImpl = WebViewImpl::fromPage(page);
+        WebDevToolsAgentImpl* agent = static_cast<WebDevToolsAgentImpl*>(viewImpl->devToolsAgent());
+        agent->flushPendingFrontendMessages();
+
         Vector<WebViewImpl*> views;
 
         // 1. Disable input events.
         const HashSet<Page*>& pages = Page::ordinaryPages();
         HashSet<Page*>::const_iterator end = pages.end();
         for (HashSet<Page*>::const_iterator it =  pages.begin(); it != end; ++it) {
             WebViewImpl* view = WebViewImpl::fromPage(*it);
             if (!view)
                 continue;
             m_frozenViews.add(view);
@@ skipping 430 matching lines @@
     m_webViewImpl->removePageOverlay(this);
 }
 
 void WebDevToolsAgentImpl::sendMessageToFrontend(PassRefPtr<WebCore::JSONObject> message)
 {
     m_frontendMessageQueue.append(message);
 }
 
 void WebDevToolsAgentImpl::flush()
 {
-    for (size_t i = 0; i < m_frontendMessageQueue.size(); ++i)
-        m_client->sendMessageToInspectorFrontend(m_frontendMessageQueue[i]->toJSONString());
-    m_frontendMessageQueue.clear();
+    flushPendingFrontendMessages();
 }
 
 void WebDevToolsAgentImpl::updateInspectorStateCookie(const String& state)
 {
     m_client->saveAgentRuntimeState(state);
 }
 
 void WebDevToolsAgentImpl::clearBrowserCache()
 {
     m_client->clearBrowserCache();
@@ skipping 13 matching lines @@
 {
     inspectorController()->setLayerTreeId(layerTreeId);
 }
 
 void WebDevToolsAgentImpl::evaluateInWebInspector(long callId, const WebString& script)
 {
     InspectorController* ic = inspectorController();
     ic->evaluateForTestInFrontend(callId, script);
 }
 
+void WebDevToolsAgentImpl::flushPendingFrontendMessages()
+{
+    InspectorController* ic = inspectorController();
+    ic->flushPendingFrontendMessages();
+
+    for (size_t i = 0; i < m_frontendMessageQueue.size(); ++i)
+        m_client->sendMessageToInspectorFrontend(m_frontendMessageQueue[i]->toJSONString());
+    m_frontendMessageQueue.clear();
+}
+
 void WebDevToolsAgentImpl::willProcessTask()
 {
+    if (!m_attached)
+        return;
     if (InspectorController* ic = inspectorController())
         ic->willProcessTask();
 }
 
 void WebDevToolsAgentImpl::didProcessTask()
 {
+    if (!m_attached)
+        return;
     if (InspectorController* ic = inspectorController())
         ic->didProcessTask();
-    if (m_attached)
-        flush();
+    flushPendingFrontendMessages();
 }
 
 WebString WebDevToolsAgent::inspectorProtocolVersion()
 {
     return WebCore::inspectorProtocolVersion();
 }
 
 bool WebDevToolsAgent::supportsInspectorProtocolVersion(const WebString& version)
 {
     return WebCore::supportsInspectorProtocolVersion(version);
@@ skipping 20 matching lines @@
         || commandName == InspectorBackendDispatcher::commandName(InspectorBackendDispatcher::kProfiler_startCmd)
         || commandName == InspectorBackendDispatcher::commandName(InspectorBackendDispatcher::kProfiler_stopCmd);
 }
 
 void WebDevToolsAgent::processPendingMessages()
 {
     PageScriptDebugServer::shared().runPendingTasks();
 }
 
 } // namespace blink