Move more GL state management to RenderState and its directory

Change-Id: Ic68584e1c08dc64be2ad43450cb6caa1de834fdc
diff --git a/libs/hwui/GradientCache.h b/libs/hwui/GradientCache.h
index 9176c76..1714e6d 100644
--- a/libs/hwui/GradientCache.h
+++ b/libs/hwui/GradientCache.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_HWUI_GRADIENT_CACHE_H
 #define ANDROID_HWUI_GRADIENT_CACHE_H
 
+#include <memory>
+
 #include <GLES3/gl3.h>
 
 #include <SkShader.h>