DevTools: add more tests to fixate bindings behavior

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

 var initialize_BindingsTest = function() {
 
 InspectorTest.preloadModule("sources");
 
-InspectorTest.dumpWorkspace = function() {
+InspectorTest.dumpWorkspace = function(previousSnapshot) {
     var uiSourceCodes = Workspace.workspace.uiSourceCodes().slice();
     var urls = uiSourceCodes.map(code => code.url());
     urls = urls.map(url => {
         if (!url.startsWith('debugger://'))
             return url;
         return url.replace(/VM\d+/g, 'VM[XXX]');
     });
 
     urls.sort(String.caseInsensetiveComparator);
+    var isAdded = new Array(urls.length).fill(false);
+    var removedLines = [];
+    if (previousSnapshot) {
+        var diff = Diff.Diff.lineDiff(previousSnapshot, urls);
+        var removedEntries = diff.filter(entry => entry[0] === Diff.Diff.Operation.Delete).map(entry => entry[1]);
+        removedLines = [].concat.apply([], removedEntries);
+        var index = 0;
+        for (var entry of diff) {
+            if (entry[0] === Diff.Diff.Operation.Delete)
+                continue;
+            if (entry[0] === Diff.Diff.Operation.Equal) {
+                index += entry[1].length;
+                continue;
+            }
+            for (var line of entry[1])
+                isAdded[index++] = true;
+        }
+        var addedEntries = diff.filter(entry => entry[0] === Diff.Diff.Operation.Insert).map(entry => entry[1]);
+        addedLines = [].concat.apply([], addedEntries);
+    }
+
+    InspectorTest.addResult(`Removed: ${removedLines.length} uiSourceCodes`);
+    for (var url of removedLines)
+        InspectorTest.addResult('[-] ' + url);
     InspectorTest.addResult(`Workspace: ${urls.length} uiSourceCodes.`);
-    for (var url of urls) {
-        InspectorTest.addResult('    ' + url);
+    for (var i = 0; i < urls.length; ++i) {
+        var url = urls[i];
+        var prefix = isAdded[i] ? '[+] ' : '    ';
+        InspectorTest.addResult(prefix + url);
     }
+    return urls;
 }
 
 InspectorTest.attachFrame = function(frameId, url, evalSourceURL) {
     var evalSource = `(${attachFrame.toString()})('${frameId}', '${url}')`;
     if (evalSourceURL)
         evalSource += '//# sourceURL=' + evalSourceURL;
     return InspectorTest.evaluateInPageAsync(evalSource);
 
     function attachFrame(frameId, url) {
         var frame = document.createElement('iframe');
@@ skipping 49 matching lines @@
 InspectorTest.waitForSourceMap = function(sourceMapURLSuffix) {
     var fulfill;
     var promise = new Promise(x => fulfill = x);
     sourceMapCallbacks.set(sourceMapURLSuffix, fulfill);
     return promise;
 }
 
 
 }