Added some comments

Added a quick intro section at the top of the class.  Also noted
the proposed new name for the class.

Change-Id: I3f79663527544aa4e910db0e5a1374b54d16ba2f
diff --git a/include/gui/Surface.h b/include/gui/Surface.h
index 2288fe7..f3455b5 100644
--- a/include/gui/Surface.h
+++ b/include/gui/Surface.h
@@ -106,6 +106,13 @@
     
 // ---------------------------------------------------------------------------
 
+/*
+ * This is a small wrapper around SurfaceTextureClient that provides some
+ * helper classes for Binder interaction.
+ *
+ * TODO: rename to SurfaceJniHelper.  May want to move SurfaceInfo and
+ * the associated lock() / unlockAndPost() calls to STC.
+ */
 class Surface : public SurfaceTextureClient
 {
 public: