Make rendering timeouts work even if paint data received early

third_party/WebKit/public/web/WebWidgetClient.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 73 matching lines @@
     // * a plugin
     // * a canvas
     // An approximation for first layout that resulted in pixels on screen.
     // Not the best heuristic, and we should replace it with something better.
     virtual void didFirstVisuallyNonEmptyLayout() { }
 
     // The frame's document first layout immediately after the parsing finished.
     // Another way to put it: first frame produced after DOMContentLoaded was dispatched.
     virtual void didFirstLayoutAfterFinishedParsing() { }
 
+    // Signal that a new page has loaded. This attaches a message to the
+    // next compositor frame after a page load commit.
+    virtual void didFirstPaintAfterLoad() { }
+
     // Called when the widget acquires or loses focus, respectively.
     virtual void didFocus() { }
     virtual void didBlur() { }
 
     // Called when the cursor for the widget changes.
     virtual void didChangeCursor(const WebCursorInfo&) { }
 
     // Called when the widget should be closed.  WebWidget::close() should
     // be called asynchronously as a result of this notification.
     virtual void closeWidgetSoon() { }
@@ skipping 80 matching lines @@
     // press or gesture tap.
     // Note: This is called even when the mouse down event is prevent default.
     virtual void onMouseDown(const WebNode& mouseDownNode) { }
 protected:
     ~WebWidgetClient() { }
 };
 
 } // namespace blink
 
 #endif