Make rendering timeouts work even if paint data received early

third_party/WebKit/public/web/WebWidgetClient.h

Index: third_party/WebKit/public/web/WebWidgetClient.h
diff --git a/third_party/WebKit/public/web/WebWidgetClient.h b/third_party/WebKit/public/web/WebWidgetClient.h
index c1ce416eb6c0355249171c581bc26725f8459619..2c1bfca8e7f234531e8e9c8431244e7811594a6a 100644
--- a/third_party/WebKit/public/web/WebWidgetClient.h
+++ b/third_party/WebKit/public/web/WebWidgetClient.h
@@ -91,6 +91,10 @@ public:
     // 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() { }