DevTools: [Persistence] implement automapping

third_party/WebKit/Source/devtools/front_end/settings/EditFileSystemView.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 29 matching lines @@
     this.registerRequiredCSS("settings/editFileSystemView.css");
     this._fileSystemPath = fileSystemPath;
 
     this._eventListeners = [
         WebInspector.fileSystemMapping.addEventListener(WebInspector.FileSystemMapping.Events.FileMappingAdded, this._update, this),
         WebInspector.fileSystemMapping.addEventListener(WebInspector.FileSystemMapping.Events.FileMappingRemoved, this._update, this),
         WebInspector.isolatedFileSystemManager.addEventListener(WebInspector.IsolatedFileSystemManager.Events.ExcludedFolderAdded, this._update, this),
         WebInspector.isolatedFileSystemManager.addEventListener(WebInspector.IsolatedFileSystemManager.Events.ExcludedFolderRemoved, this._update, this)
     ];
 
-    var mappingsHeader = this.contentElement.createChild("div", "file-system-header");
-    mappingsHeader.createChild("div", "file-system-header-text").textContent = WebInspector.UIString("Mappings");
-    mappingsHeader.appendChild(createTextButton(WebInspector.UIString("Add"), this._addMappingButtonClicked.bind(this), "add-button"));
     this._mappingsList = new WebInspector.ListWidget(this);
     this._mappingsList.element.classList.add("file-system-list");
     this._mappingsList.registerRequiredCSS("settings/editFileSystemView.css");
     var mappingsPlaceholder = createElementWithClass("div", "file-system-list-empty");
-    mappingsPlaceholder.textContent = WebInspector.UIString("No mappings");
+    var mappingsHeader = this.contentElement.createChild("div", "file-system-header");
+    mappingsHeader.createChild("div", "file-system-header-text").textContent = WebInspector.UIString("Mappings");
+    if (Runtime.experiments.isEnabled("persistence2")) {
+        mappingsPlaceholder.textContent = WebInspector.UIString("Mappings are inferred automatically via the 'Persistence 2.0' experiment.");
+    } else {
+        mappingsPlaceholder.textContent = WebInspector.UIString("No mappings");
+        mappingsHeader.appendChild(createTextButton(WebInspector.UIString("Add"), this._addMappingButtonClicked.bind(this), "add-button"));
+    }
     this._mappingsList.setEmptyPlaceholder(mappingsPlaceholder);
     this._mappingsList.show(this.contentElement);
 
     var excludedFoldersHeader = this.contentElement.createChild("div", "file-system-header");
     excludedFoldersHeader.createChild("div", "file-system-header-text").textContent = WebInspector.UIString("Excluded folders");
     excludedFoldersHeader.appendChild(createTextButton(WebInspector.UIString("Add"), this._addExcludedFolderButtonClicked.bind(this), "add-button"));
     this._excludedFoldersList = new WebInspector.ListWidget(this);
     this._excludedFoldersList.element.classList.add("file-system-list");
     this._excludedFoldersList.registerRequiredCSS("settings/editFileSystemView.css");
     var excludedFoldersPlaceholder = createElementWithClass("div", "file-system-list-empty");
@@ skipping 11 matching lines @@
         WebInspector.EventTarget.removeEventListeners(this._eventListeners);
     },
 
     _update: function()
     {
         if (this._muteUpdate)
             return;
 
         this._mappingsList.clear();
         this._mappings = [];
+        if (Runtime.experiments.isEnabled("persistence2"))
+            return;
         var mappings = WebInspector.fileSystemMapping.mappingEntries(this._fileSystemPath);
         for (var entry of mappings) {
             if (entry.configurable) {
                 this._mappingsList.appendItem(entry, true);
                 this._mappings.push(entry);
             }
         }
         for (var entry of mappings) {
             if (!entry.configurable) {
                 this._mappingsList.appendItem(entry, false);
@@ skipping 217 matching lines @@
      */
     _normalizePrefix: function(prefix)
     {
         if (!prefix)
             return "";
         return prefix + (prefix[prefix.length - 1] === "/" ? "" : "/");
     },
 
     __proto__: WebInspector.VBox.prototype
 };