Tweak layers caching for better performance in Launcher.

Change-Id: Ia6e67699d98f69c8a93385b3ecbdd814c7b16921
diff --git a/libs/hwui/LayerCache.h b/libs/hwui/LayerCache.h
index e64366f..ae792ab 100644
--- a/libs/hwui/LayerCache.h
+++ b/libs/hwui/LayerCache.h
@@ -30,6 +30,8 @@
 // Debug
 #define DEBUG_LAYERS 0
 
+// Indicates whether to remove the biggest layers first, or the smaller ones
+#define LAYER_REMOVE_BIGGEST 0
 // Textures used by layers must have dimensions multiples of this number
 #define LAYER_SIZE 64