Dump inspector protocol traffic for tests starting with inspector/elements/styles

LayoutTests/http/tests/inspector/inspector-test.js

 var initialize_InspectorTest = function() {
 
 var results = [];
 
 function consoleOutputHook(messageType)
 {
     InspectorTest.addResult(messageType + ": " + Array.prototype.slice.call(arguments, 1));
 }
 
 window._originalConsoleLog = console.log.bind(console);
@@ skipping 954 matching lines @@
         }
         var initialPanelShown = false;
         for (var folder in initialPanelByFolder) {
             if (testPath.indexOf(folder + "/") !== -1) {
                 lastLoadedPanel = initialPanelByFolder[folder];
                 promises.push(WebInspector.inspectorView.panel(lastLoadedPanel));
                 break;
             }
         }
 
+        if (testPath.startsWith("LayoutTests/inspector/elements/styles"))
+            InspectorTest.startDumpingProtocolMessages();
+
         // 3. Run test function.
         Promise.all(promises).then(function() {
             if (lastLoadedPanel)
                 WebInspector.inspectorView.showInitialPanelForTest(lastLoadedPanel);
             testFunction();
         }).catch(function(e) {
             console.error(e);
             InspectorTest.completeTest();
         });
     }
@@ skipping 73 matching lines @@
     _output("[page] " + text);
 }
 
 function _output(result)
 {
     if (!outputElement)
         createOutputElement();
     outputElement.appendChild(document.createTextNode(result));
     outputElement.appendChild(document.createElement("br"));
 }