Dump inspector traffic to stderr for all tests under inspector/sources/debugger-step

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

Index: LayoutTests/http/tests/inspector/debugger-test.js
diff --git a/LayoutTests/http/tests/inspector/debugger-test.js b/LayoutTests/http/tests/inspector/debugger-test.js
index fa6310991db77b03f19eef7bf434b68ca18254f9..b71c0a2c4915ddd63b29004b1c573f7b1276a03e 100644
--- a/LayoutTests/http/tests/inspector/debugger-test.js
+++ b/LayoutTests/http/tests/inspector/debugger-test.js
@@ -4,6 +4,9 @@ InspectorTest.preloadPanel("sources");
 
 InspectorTest.startDebuggerTest = function(callback, quiet)
 {
+    var testPath = WebInspector.settings.createSetting("testPath", "").get();
+    if (testPath.startsWith("LayoutTests/inspector/sources/debugger-step/"))
+        InspectorTest.startDumpingProtocolMessages();
     console.assert(InspectorTest.debuggerModel.debuggerEnabled(), "Debugger has to be enabled");
     if (quiet !== undefined)
         InspectorTest._quiet = quiet;