SF: dump planner layers in dumpsys

Fixes: 186653932
Test: adb shell dumpsys SurfaceFlinger
Test: adb shell dumpsys SurfaceFlinger --planner --layers
Change-Id: I76a2babaf1544bb05bb3817b79e136420c904340
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index b048682..64caaf5 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -4982,6 +4982,13 @@
         result.append("\n");
     }
 
+    {
+        DumpArgs plannerArgs;
+        plannerArgs.add(); // first argument is ignored
+        plannerArgs.add(String16("--layers"));
+        dumpPlannerInfo(plannerArgs, result);
+    }
+
     /*
      * Dump HWComposer state
      */