SharedBufferStack now can grow up to 16 buffers.

there is a new resize() api, which currently only allows growing.

Change-Id: Ia37b81b73be466d2491ffed7f3a23cd8e113c6fe
diff --git a/include/surfaceflinger/Surface.h b/include/surfaceflinger/Surface.h
index 7ab3a00..973780f 100644
--- a/include/surfaceflinger/Surface.h
+++ b/include/surfaceflinger/Surface.h
@@ -217,6 +217,7 @@
     int  connect(int api);
     int  disconnect(int api);
     int  crop(Rect const* rect);
+    int  setBufferCount(int bufferCount);
 
     /*
      *  private stuff...