Track scissored damage area for WebGL

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index a695829e1b19abbd4aea11f4f8f83fd1b9f2cf2e..470cb6ff09987ad751b59e01171bcdc738247a11 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -186,7 +186,7 @@ RenderLayerCompositor* RenderLayer::compositor() const
     return renderer()->view()->compositor();
 }
 
-void RenderLayer::contentChanged(ContentChangeType changeType)
+void RenderLayer::contentChanged(ContentChangeType changeType, const IntRect& dirtyRect)
 {
     // updateLayerCompositingState will query compositingReasons for accelerated overflow scrolling.
     // This is tripped by LayoutTests/compositing/content-changed-chicken-egg.html
@@ -207,7 +207,7 @@ void RenderLayer::contentChanged(ContentChangeType changeType)
     }
 
     if (m_compositedLayerMapping)
-        m_compositedLayerMapping->contentChanged(changeType);
+        m_compositedLayerMapping->contentChanged(changeType, dirtyRect);
 }
 
 bool RenderLayer::paintsWithFilters() const