Allow skipping camera layers for HDR callback

Bug: 218728138
Test: make; verified callback didn't change for youtube HDR
Change-Id: I3ee4999d221052be5d8d093033b90bfe6b3aa87e
diff --git a/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop b/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
index 7702ea2..bcbe21a 100644
--- a/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
+++ b/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
@@ -461,4 +461,13 @@
     scope: Public
     access: Readonly
     prop_name: "ro.surface_flinger.enable_sdr_dimming"
+}
+
+# Ignores Camera layers when calculating HDR coverage information
+prop {
+    api_name: "ignore_hdr_camera_layers"
+    type: Boolean
+    scope: Public
+    access: Readonly
+    prop_name: "ro.surface_flinger.ignore_hdr_camera_layers"
 }
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