Apply gamma correction to font rendering.

Change-Id: I1b05f40e356221b2a5eb9400e67d77ecd98ed6c4
diff --git a/libs/hwui/TextDropShadowCache.cpp b/libs/hwui/TextDropShadowCache.cpp
index f95d2be..9d54277 100644
--- a/libs/hwui/TextDropShadowCache.cpp
+++ b/libs/hwui/TextDropShadowCache.cpp
@@ -17,6 +17,7 @@
 #define LOG_TAG "OpenGLRenderer"
 
 #include "TextDropShadowCache.h"
+#include "Properties.h"
 
 namespace android {
 namespace uirenderer {