Update from https://crrev.com/304121

cc/layers/layer_impl.h

Index: cc/layers/layer_impl.h
diff --git a/cc/layers/layer_impl.h b/cc/layers/layer_impl.h
index 5fe679c30f72b3eceb902a54a0cbf0d2a42b69c5..12f1dcaeeff39c10176523f6d21bbe3bc5d6b2de 100644
--- a/cc/layers/layer_impl.h
+++ b/cc/layers/layer_impl.h
@@ -323,6 +323,9 @@ class CC_EXPORT LayerImpl : public LayerAnimationValueObserver,
     return draw_properties_.screen_space_transform;
   }
   float draw_opacity() const { return draw_properties_.opacity; }
+  SkXfermode::Mode draw_blend_mode() const {
+    return draw_properties_.blend_mode;
+  }
   bool draw_opacity_is_animating() const {
     return draw_properties_.opacity_is_animating;
   }