Track scissored damage area for WebGL

Source/core/rendering/RenderImage.cpp

Index: Source/core/rendering/RenderImage.cpp
diff --git a/Source/core/rendering/RenderImage.cpp b/Source/core/rendering/RenderImage.cpp
index 25f8ab12ae57a7ac7d5a0b7111fe12a14691516e..c74a4a28722f1949b97ba0c525dc8b44c64d4f28 100644
--- a/Source/core/rendering/RenderImage.cpp
+++ b/Source/core/rendering/RenderImage.cpp
@@ -250,7 +250,7 @@ void RenderImage::paintInvalidationOrMarkForLayout(bool imageSizeChangedToAccomo
     }
 
     // Tell any potential compositing layers that the image needs updating.
-    contentChanged(ImageChanged);
+    contentChanged(ImageChanged, enclosingIntRect(paintInvalidationRect));
 }
 
 void RenderImage::notifyFinished(Resource* newImage)
@@ -266,7 +266,7 @@ void RenderImage::notifyFinished(Resource* newImage)
     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());
     }
 }