Integrate from //sandbox/mathias/donut/...@145728

SurfaceFlinger rework for new EGL driver model support.
diff --git a/opengl/libs/egl_impl.h b/opengl/libs/egl_impl.h
index 62ce3fc..4e0c7bf 100644
--- a/opengl/libs/egl_impl.h
+++ b/opengl/libs/egl_impl.h
@@ -20,6 +20,7 @@
 #include <ctype.h>
 
 #include <EGL/egl.h>
+#include <EGL/eglext.h>
 
 // ----------------------------------------------------------------------------
 namespace android {
@@ -36,6 +37,8 @@
     int                 unavailable;
 };
 
+EGLImageKHR egl_get_image_for_current_context(EGLImageKHR image);
+
 // ----------------------------------------------------------------------------
 }; // namespace android
 // ----------------------------------------------------------------------------