cc: nine patch: add occlusion support

ui/wm/core/shadow.cc

Index: ui/wm/core/shadow.cc
diff --git a/ui/wm/core/shadow.cc b/ui/wm/core/shadow.cc
index a5f736ae08057ec362c72b4cc0c7f4d13d1be1f7..dc80187fc9e7cecf210d97d690f9d80aabb8fe6b 100644
--- a/ui/wm/core/shadow.cc
+++ b/ui/wm/core/shadow.cc
@@ -182,12 +182,13 @@ void Shadow::UpdateLayerBounds() {
   int aperture = GetShadowApertureForStyle(style_);
   int aperture_x = std::min(aperture, layer_bounds.width() / 2);
   int aperture_y = std::min(aperture, layer_bounds.height() / 2);
+
   shadow_layer_->UpdateNinePatchLayerAperture(
       gfx::Rect(aperture_x, aperture_y,
                 image_size_.width() - aperture_x * 2,
                 image_size_.height() - aperture_y * 2));
-  shadow_layer_->UpdateNinePatchLayerBorder(
-      gfx::Rect(aperture_x, aperture_y, aperture_x * 2, aperture_y * 2));
+  shadow_layer_->UpdateNinePatchOcclusion(
+      content_bounds_ + gfx::Vector2d(interior_inset_, interior_inset_));
 }
 
 }  // namespace wm