factor EGL/GL and surface creation out of DisplayHardware

Change-Id: Icd85a6a4caad06f056578008af3e21666fa8b1f4
diff --git a/services/surfaceflinger/LayerBase.h b/services/surfaceflinger/LayerBase.h
index d227b2d..c689297 100644
--- a/services/surfaceflinger/LayerBase.h
+++ b/services/surfaceflinger/LayerBase.h
@@ -25,6 +25,7 @@
 #include <GLES/gl.h>
 
 #include <utils/RefBase.h>
+#include <utils/String8.h>
 
 #include <ui/Region.h>