[Shadows] Add shadow radius to sf layer state (2/n)

Bug: 136561771
Test: atest SurfaceFlinger_Test
Change-Id: Icafe852eaad195163b48b802db2a4b092aa30926
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index e004e95..e392bc5 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -406,6 +406,12 @@
         what |= eMetadataChanged;
         metadata.merge(other.metadata);
     }
+
+    if (other.what & eShadowRadiusChanged) {
+        what |= eShadowRadiusChanged;
+        shadowRadius = other.shadowRadius;
+    }
+
     if ((other.what & what) != other.what) {
         ALOGE("Unmerged SurfaceComposer Transaction properties. LayerState::merge needs updating? "
               "other.what=0x%" PRIu64 " what=0x%" PRIu64,