Magnifier border is now more visible on light backgrounds.

ash/magnifier/partial_magnification_controller.h

Index: ash/magnifier/partial_magnification_controller.h
diff --git a/ash/magnifier/partial_magnification_controller.h b/ash/magnifier/partial_magnification_controller.h
index 3a7cf0fdcf926f886e6eace327832679857520a5..b42f61df9c4baebe423c849ffe27b49e81b1a04b 100644
--- a/ash/magnifier/partial_magnification_controller.h
+++ b/ash/magnifier/partial_magnification_controller.h
@@ -47,6 +47,7 @@ class ASH_EXPORT PartialMagnificationController : public ui::EventHandler,
  private:
   friend class PartialMagnificationControllerTestApi;
 
+  class BorderRenderer;
   class ContentMask;
 
   // ui::EventHandler:
@@ -84,6 +85,11 @@ class ASH_EXPORT PartialMagnificationController : public ui::EventHandler,
   std::unique_ptr<ui::Layer> zoom_layer_;
   // Draws an outline that is overlayed on top of |zoom_layer_|.
   std::unique_ptr<ui::Layer> border_layer_;
+  // Draws a multicolored black/white/black border on top of |border_layer_|.
+  // This must be ordered after |border_layer_| so that it gets destroyed after
+  // |border_layer_|, otherwise |border_layer_| will have a pointer to a deleted
+  // delegate.
+  std::unique_ptr<BorderRenderer> border_renderer_;
   // Masks the content of |zoom_layer_| so that only a circle is magnified.
   std::unique_ptr<ContentMask> zoom_mask_;
   // Masks the content of |border_layer_| so that only a circle outline is