Introduce a mean to add render features in layers with no sources

This change also uses the support in the LocationIndicator layer, to
return a point feature when queried in correspondence of the location
indicator.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/mbgl/renderer/render_layer.hpp b/src/mbgl/renderer/render_layer.hpp
index f7232a5aa0..553730de24 100644
--- a/src/mbgl/renderer/render_layer.hpp
+++ b/src/mbgl/renderer/render_layer.hpp
@@ -21,6 +21,7 @@ class TransformState;
 class PatternAtlas;
 class LineAtlas;
 class SymbolBucket;
+class DynamicFeatureIndex;
 
 class LayerRenderData {
 public:
@@ -106,6 +107,8 @@ public:
         return false;
     };
 
+    virtual void populateDynamicRenderFeatureIndex(DynamicFeatureIndex&) const {}
+
     virtual void prepare(const LayerPrepareParameters&);
 
     const LayerPlacementData& getPlacementData() const { return placementData; }