Issue repaints when offsetFromRenderer changes for any squashed layer.

LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt

Index: LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt
diff --git a/LayoutTests/compositing/squashing/repaint-via-layout-offset-expected.txt b/LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt
similarity index 65%
copy from LayoutTests/compositing/squashing/repaint-via-layout-offset-expected.txt
copy to LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt
index 68907331badfde3433effe43500f936afb66afd3..a9189f1f3cfde6682d1175b692af5db91a947372 100644
--- a/LayoutTests/compositing/squashing/repaint-via-layout-offset-expected.txt
+++ b/LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt
@@ -1,3 +1,4 @@
+CONSOLE MESSAGE: line 22: remove
 (GraphicsLayer
   (bounds 800.00 600.00)
   (children 1
@@ -10,18 +11,16 @@
           (children 2
             (GraphicsLayer
               (position 8.00 8.00)
-              (bounds 200.00 200.00)
-              (contentsOpaque 1)
-              (drawsContent 1)
-              (backgroundColor #ADD8E6)
+              (bounds 500.00 500.00)
             )
             (GraphicsLayer
-              (position 50.00 50.00)
-              (bounds 50.00 50.00)
+              (position 55.00 55.00)
+              (bounds 500.00 500.00)
               (drawsContent 1)
               (repaint rects
+                (rect 55.00 55.00 500.00 500.00)
+                (rect 0.00 0.00 500.00 500.00)

[chrishtr, 2014/06/12 23:49:37]

This second rect would not have been present but for my CL.

                 (rect 0.00 0.00 50.00 50.00)
-                (rect 0.00 0.00 40.00 40.00)
               )
             )
           )