Split platform functions from entrypoints

Test: Built, flashed, ran some GLES apps
Bug: 110883880
Change-Id: I8697002582c9ca4deea926c298c5e9ab7ac39580
diff --git a/opengl/libs/EGL/egldefs.h b/opengl/libs/EGL/egldefs.h
index 4990af6..1a88678 100644
--- a/opengl/libs/EGL/egldefs.h
+++ b/opengl/libs/EGL/egldefs.h
@@ -38,12 +38,16 @@
     };
 
     inline egl_connection_t() : dso(nullptr) { }
+
     void *              dso;
     gl_hooks_t *        hooks[2];
     EGLint              major;
     EGLint              minor;
     egl_t               egl;
 
+    // Functions implemented or redirected by platform libraries
+    platform_impl_t     platform;
+
     void*               libEgl;
     void*               libGles1;
     void*               libGles2;
@@ -63,6 +67,7 @@
 
 extern char const * const gl_names[];
 extern char const * const egl_names[];
+extern char const * const platform_names[];
 
 extern egl_connection_t gEGLImpl;