graphics: Include stddef.h for size_t.
graphics.h uses size_t, but doesn't pull in a declaration. This results
in compile errors if code that includes graphics.h (such as
hardware/hardware.h) doesn't happen to have a size_t declaration from
elsewhere.
Change-Id: I0f3882c3dce20425697d25366d49930b2251ef7f
diff --git a/include/system/graphics.h b/include/system/graphics.h
index cf2d7de..ac5ae96 100644
--- a/include/system/graphics.h
+++ b/include/system/graphics.h
@@ -17,6 +17,7 @@
#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
+#include <stddef.h>
#include <stdint.h>
#ifdef __cplusplus