Add option --dump-render-tree to content_shell to dump the render tree as text.

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #pragma once
 
 #include <set>
 #include <string>
@@ skipping 96 matching lines @@
   // loading feedback. See WebContents::IsLoading()
   virtual void LoadingStateChanged(WebContents* source) {}
 
   // Notifies the delegate that the page has made some progress loading.
   // |progress| is a value between 0.0 (nothing loaded) to 1.0 (page fully
   // loaded).
   // Note that to receive this notification, you must have called
   // SetReportLoadProgressEnabled(true) in the render view.
   virtual void LoadProgressChanged(double progress) {}
 
+  // Notifies the delegate the the page finished loadingm, i.e. the main
+  // document was loaded, parsed, and the onload event handlers are finished.
+  virtual void DidFinishLoad(WebContents* contents) {}

[jam, 2012/01/26 18:47:34]

we should avoid adding methods to this interface since it's already big,
especially if that callback can be gathered from another place, i.e.
WebContentsObserver

[jochen (gone - plz use gerrit), 2012/01/27 08:49:56]

Done.

+
   // Request the delegate to close this web contents, and do whatever cleanup
   // it needs to do.
   virtual void CloseContents(WebContents* source) {}
 
   // Informs the delegate that the underlying RenderViewHost has been swapped
   // out so it can perform any cleanup necessary.
   virtual void SwappedOut(WebContents* source) {}
 
   // Request the delegate to move this tab contents to the specified position
   // in screen coordinates.
@@ skipping 271 matching lines @@
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_