DevTools: introduce persistence/ module

third_party/WebKit/LayoutTests/http/tests/inspector/isolated-filesystem-test.js

 var initialize_IsolatedFileSystemTest = function() {
 
 InspectorFrontendHost.isolatedFileSystem = function(name)
 {
     return InspectorTest.TestFileSystem._instances[name];
 }
 
 InspectorTest.TestFileSystem = function(fileSystemPath)
 {
     this.root = new InspectorTest.TestFileSystem.Entry(this, "", true, null);
@@ skipping 88 matching lines @@
     addFile: function(name, content)
     {
         var child = new InspectorTest.TestFileSystem.Entry(this._fileSystem, name, false, this);
         this._childrenMap[name] = child;
         this._children.push(child);
         child.parent = this;
         child.content = new Blob([content], {type: 'text/plain'});
         return child;
     },
 
+    setContent: function(content)
+    {
+        this.content = new Blob([content], {type: 'text/plain'});
+        var fullPath = this._fileSystem.fileSystemPath + this.fullPath;
+        InspectorFrontendHost.events.dispatchEventToListeners(InspectorFrontendHostAPI.Events.FileSystemFilesChanged, [fullPath]);
+    },
+
     createReader: function()
     {
         return new InspectorTest.TestFileSystem.Reader(this._children);
     },
 
     createWriter: function(success, failure)
     {
         success(new InspectorTest.TestFileSystem.Writer(this));
     },
 
@@ skipping 81 matching lines @@
     truncate: function(num)
     {
         this._entry._timestamp += this._modificationTimesDelta;
         this._entry.content = this._entry.content.slice(0, num);
         if (this.onwriteend)
             this.onwriteend();
     }
 }
 
 };