Add dithering to gradients

Change-Id: Ic1208855bde3a254eca2fd7cef43e0f1318ce419
diff --git a/libs/hwui/Caches.h b/libs/hwui/Caches.h
index 4cbac41..ad1098c 100644
--- a/libs/hwui/Caches.h
+++ b/libs/hwui/Caches.h
@@ -38,6 +38,7 @@
 #include "TextDropShadowCache.h"
 #include "FboCache.h"
 #include "ResourceCache.h"
+#include "Dither.h"
 
 namespace android {
 namespace uirenderer {
@@ -250,6 +251,7 @@
     TextDropShadowCache dropShadowCache;
     FboCache fboCache;
     ResourceCache resourceCache;
+    Dither dither;
 
     GammaFontRenderer* fontRenderer;