Hook up plumbing for minification/magnification filters.

cc/output/ca_layer_overlay.h

Index: cc/output/ca_layer_overlay.h
diff --git a/cc/output/ca_layer_overlay.h b/cc/output/ca_layer_overlay.h
index 00a4039f1362c9c8d1c2a9a9f5082d8a8a6a3e7c..195d6cda91a1096e3c30568190912cbdca26b3dd 100644
--- a/cc/output/ca_layer_overlay.h
+++ b/cc/output/ca_layer_overlay.h
@@ -42,6 +42,8 @@ class CC_EXPORT CALayerOverlay {
   gfx::RectF bounds_rect;
   // The transform to apply to the CALayer.
   SkMatrix44 transform = SkMatrix44(SkMatrix44::kIdentity_Constructor);
+  // The minification and magnification filters for the CALayer.
+  unsigned filter;
 };
 
 typedef std::vector<CALayerOverlay> CALayerOverlayList;