DevTools: make throttler with timeout respect the timeout.

third_party/WebKit/LayoutTests/http/tests/inspector/console-test.js

 var initialize_ConsoleTest = function() {
 
 InspectorTest.preloadModule("source_frame");
 InspectorTest.preloadPanel("console");
 
 InspectorTest.selectMainExecutionContext = function()
 {
     var executionContexts = InspectorTest.mainTarget.runtimeModel.executionContexts();
     for (var context of executionContexts) {
         if (context.isDefault) {
@@ skipping 224 matching lines @@
 InspectorTest.dumpConsoleCounters = function()
 {
     var counter = WebInspector.Main.WarningErrorCounter._instanceForTest;
     for (var index = 0; index < counter._titles.length; ++index)
         InspectorTest.addResult(counter._titles[index]);
     InspectorTest.dumpConsoleClassesBrief();
 }
 
 InspectorTest.expandConsoleMessages = function(callback, deepFilter, sectionFilter)
 {
+    WebInspector.ConsoleView.instance()._viewportThrottler.flush();
     var messageViews = WebInspector.ConsoleView.instance()._visibleViewMessages;
 
     // Initiate round-trips to fetch necessary data for further rendering.
     for (var i = 0; i < messageViews.length; ++i)
         messageViews[i].contentElement();
 
     InspectorTest.deprecatedRunAfterPendingDispatches(expandTreeElements);
 
     function expandTreeElements()
     {
@@ skipping 148 matching lines @@
         if (consoleView._visibleViewMessages.length === expectedCount) {
             InspectorTest.addResult("Message count: " + expectedCount);
             callback();
         } else {
             InspectorTest.addSniffer(consoleView, "_messageAppendedForTests", checkAndReturn);
         }
     }
 }
 
 }