Track scissored damage area for WebGL

Source/core/rendering/RenderImage.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Allan Sandfeld Jensen (kde@carewolf.com)
  *           (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011-2012. All rights reserved.
  *
@@ skipping 232 matching lines @@
     }
 
     {
         // FIXME: We should not be allowing paint invalidations during layout. crbug.com/339584
         AllowPaintInvalidationScope scoper(frameView());
         DisableCompositingQueryAsserts disabler;
         invalidatePaintRectangle(paintInvalidationRect);
     }
 
     // Tell any potential compositing layers that the image needs updating.
-    contentChanged(ImageChanged);
+    contentChanged(ImageChanged, enclosingIntRect(paintInvalidationRect));
 }
 
 void RenderImage::notifyFinished(Resource* newImage)
 {
     if (!m_imageResource)
         return;
 
     if (documentBeingDestroyed())
         return;
 
     invalidateBackgroundObscurationStatus();
 
     if (newImage == m_imageResource->cachedImage()) {
         // tell any potential compositing layers
         // that the image is done and they can reference it directly.
-        contentChanged(ImageChanged);
+        contentChanged(ImageChanged, IntRect());
     }
 }
 
 void RenderImage::paintReplaced(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
     ImagePainter(*this).paintReplaced(paintInfo, paintOffset);
 }
 
 void RenderImage::paint(const PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 {
@@ skipping 179 matching lines @@
         return 0;
 
     ImageResource* cachedImage = m_imageResource->cachedImage();
     if (cachedImage && cachedImage->image() && cachedImage->image()->isSVGImage())
         return toSVGImage(cachedImage->image())->embeddedContentBox();
 
     return 0;
 }
 
 } // namespace blink