Offset rects by origin when projecting from composited to graphics layer.

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index d00a9f1ba3b55d0baefd64061a830747ac46493c..60159e585cb995e6ee9840608e2c0f1a45260411 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -1310,8 +1310,12 @@ unsigned Internals::touchEventHandlerCount(Document* document, ExceptionState& e
 static RenderLayer* findRenderLayerForGraphicsLayer(RenderLayer* searchRoot, GraphicsLayer* graphicsLayer, IntSize* layerOffset, String* layerType)
 {
     *layerOffset = IntSize();
-    if (searchRoot->hasCompositedLayerMapping() && graphicsLayer == searchRoot->compositedLayerMapping()->mainGraphicsLayer())
+    if (searchRoot->hasCompositedLayerMapping() && graphicsLayer == searchRoot->compositedLayerMapping()->mainGraphicsLayer()) {
+        CompositedLayerMappingPtr compositedLayerMapping = searchRoot->compositedLayerMapping();
+        LayoutSize offset = compositedLayerMapping->contentOffsetInCompositingLayer();
+        *layerOffset = IntSize(offset.width(), offset.height());
         return searchRoot;
+    }
 
     GraphicsLayer* layerForScrolling = searchRoot->scrollableArea() ? searchRoot->scrollableArea()->layerForScrolling() : 0;
     if (graphicsLayer == layerForScrolling) {