[inspector] added step-into test to cover most stepInto cases

test/inspector/protocol-test.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 InspectorTest = {};
 InspectorTest._dispatchTable = new Map();
 InspectorTest._requestId = 0;
 InspectorTest._dumpInspectorProtocolMessages = false;
 InspectorTest._eventHandler = {};
 
@@ skipping 95 matching lines @@
 {
   for (var frame of callFrames) {
     var functionName = frame.functionName || '(anonymous)';
     var url = frame.url ? frame.url : InspectorTest._scriptMap.get(frame.location.scriptId).url;
     var lineNumber = frame.location ? frame.location.lineNumber : frame.lineNumber;
     var columnNumber = frame.location ? frame.location.columnNumber : frame.columnNumber;
     InspectorTest.log(`${functionName} (${url}:${lineNumber}:${columnNumber})`);
   }
 }
 
+InspectorTest.logCallFrameSourceLocation = function(callFrame)
+{
+  var scriptId = callFrame.location.scriptId;
+  if (!InspectorTest._scriptMap || !InspectorTest._scriptMap.has(scriptId)) {
+    InspectorTest.log("InspectorTest.setupScriptMap should be called before Protocol.Debugger.enable.");
+    InspectorTest.completeTest();
+  }
+  var script = InspectorTest._scriptMap.get(scriptId);
+  if (!script.scriptSource) {
+    return Protocol.Debugger.getScriptSource({ scriptId })
+      .then(message => script.scriptSource = message.result.scriptSource)
+      .then(dumpSourceWithLocation);
+  }
+  return Promise.resolve().then(dumpSourceWithLocation);
+
+  function dumpSourceWithLocation() {
+    var location = callFrame.location;
+    var lines = script.scriptSource.split('\n');
+    var line = lines[location.lineNumber];
+    line = line.slice(0, location.columnNumber) + '#' + (line.slice(location.columnNumber) || '');
+    lines[location.lineNumber] = line;
+    InspectorTest.log(lines.slice(Math.max(location.lineNumber - 1, 0), location.lineNumber + 2).join('\n'));
+    InspectorTest.log('');
+  }
+}
+
 InspectorTest.logAsyncStackTrace = function(asyncStackTrace)
 {
   while (asyncStackTrace) {
     if (asyncStackTrace.promiseCreationFrame) {
       var frame = asyncStackTrace.promiseCreationFrame;
       InspectorTest.log(`-- ${asyncStackTrace.description} (${frame.url
                         }:${frame.lineNumber}:${frame.columnNumber})--`);
     } else {
       InspectorTest.log(`-- ${asyncStackTrace.description} --`);
     }
@@ skipping 110 matching lines @@
       if (eventName === "Debugger.scriptParsed" && messageObject.params.url === "wait-pending-tasks.js")
         return;
       if (eventHandler)
         eventHandler(messageObject);
     }
   } catch (e) {
     InspectorTest.log("Exception when dispatching message: " + e + "\n" + e.stack + "\n message = " + JSON.stringify(messageObject, null, 2));
     InspectorTest.completeTest();
   }
 }