Add early-injection capability to user scripts. I haven't yet

webkit/glue/webview_delegate.h

 // Copyright (c) 2006-2008 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.
 
 // WebCore provides hooks for several kinds of functionality, allowing separate
 // classes termed "delegates" to receive notifications (in the form of direct
 // function calls) when certain events are about to occur or have just occurred.
 // In some cases, the delegate implements the needed functionality; in others,
 // the delegate has some control over the behavior but doesn't actually
 // implement it.  For example, the UI delegate is responsible for showing a
@@ skipping 180 matching lines @@
 
   // The original version of this is WindowScriptObjectAvailable, below. This
   // is a Chrome-specific version that serves the same purpose, but has been
   // renamed since we haven't implemented WebScriptObject.  Our embedding
   // implementation binds native objects to the window via the webframe instead.
   // TODO(pamg): If we do implement WebScriptObject, we may wish to switch to
   // using the original version of this function.
   virtual void WindowObjectCleared(WebFrame* webframe) {
   }
 
+  // Notifies that the documentElement for the document in a webframe has been
+  // created. This is called before anything else is parsed or executed for the
+  // document.
+  virtual void DocumentElementAvailable(WebFrame* webframe) {
+  }
+
   // PolicyDelegate ----------------------------------------------------------
 
   // This method is called to notify the delegate, and let it modify a
   // proposed navigation. It will be called before loading starts, and
   // on every redirect.
   //
   // disposition specifies what should normally happen for this
   // navigation (open in current tab, start a new tab, start a new
   // window, etc).  This method can return an altered disposition, and
   // take any additional separate action it wants to.
@@ skipping 562 matching lines @@
   virtual void DidAddHistoryItem() { }
 
   WebViewDelegate() { }
   virtual ~WebViewDelegate() { }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebViewDelegate);
 };
 
 #endif  // WEBKIT_GLUE_WEBVIEW_DELEGATE_H_