Compute paint invalidation rects for selection in the space of the backing GraphicsLayer

LayoutTests/compositing/squashing/selection-repaint-with-gaps-expected.txt

Index: LayoutTests/compositing/squashing/selection-repaint-with-gaps-expected.txt
diff --git a/LayoutTests/compositing/squashing/selection-repaint-with-gaps-expected.txt b/LayoutTests/compositing/squashing/selection-repaint-with-gaps-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3c5ffb90ec23a0ab733064cf47d97e4d439801f4
--- /dev/null
+++ b/LayoutTests/compositing/squashing/selection-repaint-with-gaps-expected.txt
@@ -0,0 +1,64 @@
+This test passes if the highlighted area includes the gaps between scrolled children.
+lorem ipsumlorem ipsumlorem ipsum
+(GraphicsLayer
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (drawsContent 1)
+      (children 1
+        (GraphicsLayer
+          (children 2
+            (GraphicsLayer
+              (position 8.00 28.00)
+              (bounds 300.00 500.00)
+            )
+            (GraphicsLayer
+              (position 15.00 35.00)
+              (bounds 100.00 210.00)
+              (drawsContent 1)
+              (repaint rects
+                (rect 34.00 80.00 6.00 19.00)
+                (rect 0.00 80.00 35.00 39.00)
+              )
+            )
+          )
+        )
+      )
+    )
+  )
+)
+(GraphicsLayer
+  (bounds 800.00 600.00)
+  (children 1
+    (GraphicsLayer
+      (bounds 800.00 600.00)
+      (contentsOpaque 1)
+      (drawsContent 1)
+      (children 1
+        (GraphicsLayer
+          (children 2
+            (GraphicsLayer
+              (position 8.00 28.00)
+              (bounds 300.00 500.00)
+            )
+            (GraphicsLayer
+              (position 15.00 35.00)
+              (bounds 100.00 210.00)
+              (drawsContent 1)
+              (repaint rects
+                (rect 34.00 160.00 6.00 19.00)
+                (rect 34.00 80.00 6.00 39.00)
+                (rect 0.00 160.00 35.00 39.00)
+                (rect 0.00 119.00 100.00 11.00)
+                (rect 0.00 80.00 35.00 39.00)
+              )
+            )
+          )
+        )
+      )
+    )
+  )
+)
+