Make rendering timeouts work even if paint data received early

content/renderer/render_widget.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_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 
 #include <deque>
 #include <map>
 
@@ skipping 154 matching lines @@
 
   // IPC::Sender
   bool Send(IPC::Message* msg) override;
 
   // blink::WebWidgetClient
   void didAutoResize(const blink::WebSize& new_size) override;
   void initializeLayerTreeView() override;
   blink::WebLayerTreeView* layerTreeView() override;
   void didFirstVisuallyNonEmptyLayout() override;
   void didFirstLayoutAfterFinishedParsing() override;
+  void didFirstPaintAfterLoad() override;
   void didFocus() override;
   void didBlur() override;
   void didChangeCursor(const blink::WebCursorInfo&) override;
   void closeWidgetSoon() override;
   void show(blink::WebNavigationPolicy) override;
   blink::WebRect windowRect() override;
   void setToolTipText(const blink::WebString& text,
                       blink::WebTextDirection hint) override;
   void setWindowRect(const blink::WebRect&) override;
   blink::WebRect windowResizerRect() override;
@@ skipping 616 matching lines @@
   ui::MenuSourceType context_menu_source_type_;
   bool has_host_context_menu_location_;
   gfx::Point host_context_menu_location_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_