Better debug info for layers.

Change-Id: I816c2446a33a1135553eaeea2f89c7418641cfe1
diff --git a/core/java/android/view/View.java b/core/java/android/view/View.java
index 39ec26d..20b3b46 100644
--- a/core/java/android/view/View.java
+++ b/core/java/android/view/View.java
@@ -2226,7 +2226,11 @@
      */
     public static final int LAYER_TYPE_HARDWARE = 2;
     
-    @ViewDebug.ExportedProperty(category = "drawing")
+    @ViewDebug.ExportedProperty(category = "drawing", mapping = {
+            @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"),
+            @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"),
+            @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE")
+    })
     int mLayerType = LAYER_TYPE_NONE;
     Paint mLayerPaint;