Implement per-display EGLConfig and configless EGLContext

Bug: 12230666
Change-Id: Icca608b108cbdcab9cf01a9236d8cdbda000a836
Signed-off-by: Jesse Hall <jessehall@google.com>
diff --git a/services/surfaceflinger/RenderEngine/RenderEngine.h b/services/surfaceflinger/RenderEngine/RenderEngine.h
index 4dc9457..577dc0a 100644
--- a/services/surfaceflinger/RenderEngine/RenderEngine.h
+++ b/services/surfaceflinger/RenderEngine/RenderEngine.h
@@ -25,6 +25,8 @@
 #include <EGL/eglext.h>
 #include <ui/mat4.h>
 
+#define EGL_NO_CONFIG ((EGLConfig)0)
+
 // ---------------------------------------------------------------------------
 namespace android {
 // ---------------------------------------------------------------------------