1 files changed, 54 insertions, 7 deletions

diff --git a/WebCore/inspector/front-end/Resource.js b/WebCore/inspector/front-end/Resource.js
index 9da7f82..aefdd6c 100644
--- a/WebCore/inspector/front-end/Resource.js
+++ b/WebCore/inspector/front-end/Resource.js
@@ -625,22 +625,69 @@ WebInspector.Resource.prototype = {
         return this._content;
     },
 
-    set content(content)
+    get contentTimestamp()
+    {
+        return this._contentTimestamp;
+    },
+
+    setInitialContent: function(content)
     {
-        var data = { oldContent: this._content, oldContentTimestamp: this._contentTimestamp };
         this._content = content;
-        this._contentTimestamp = new Date();
+    },
+
+    isLocallyModified: function()
+    {
+        return !!this._baseRevision;
+    },
+
+    setContent: function(newContent, onRevert)
+    {
+        var revisionResource = new WebInspector.Resource(null, this.url);
+        revisionResource.type = this.type;
+        revisionResource.loader = this.loader;
+        revisionResource.timestamp = this.timestamp;
+        revisionResource._content = this._content;
+        revisionResource._actualResource = this;
+        revisionResource._fireOnRevert = onRevert;
+
+        if (this.finished)
+            revisionResource.finished = true;
+        else {
+            function finished()
+            {
+                this.removeEventListener("finished", finished);
+                revisionResource.finished = true;
+            }
+            this.addEventListener("finished", finished.bind(this));
+        }
+
+        if (!this._baseRevision)
+            this._baseRevision = revisionResource;
+        else
+            revisionResource._baseRevision = this._baseRevision;
+
+        var data = { revision: revisionResource };
+        this._content = newContent;
+        this.timestamp = new Date();
         this.dispatchEventToListeners("content-changed", data);
     },
 
-    get contentTimestamp()
+    revertToThis: function()
     {
-        return this._contentTimestamp;
+        if (!this._actualResource || !this._fireOnRevert)
+            return;
+
+        function callback(content)
+        {
+            if (content)
+                this._fireOnRevert(content);
+        }
+        this.requestContent(callback.bind(this));
     },
 
-    setInitialContent: function(content)
+    get baseRevision()
     {
-        this._content = content;
+        return this._baseRevision;
     },
 
     requestContent: function(callback)