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

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index d19ee91ff2b1e7319ca04c9daef686845669f4a0..d1a15f777d7e980aefa90c6f9296a51d9217d41b 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -114,6 +114,10 @@ class CONTENT_EXPORT WebContentsDelegate {
   // 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) {}