Revert "Get rid of IGraphicBufferAlloc"

This reverts commit 78491c9f694cb0767996503c629776a8eda950d7.

Change-Id: I78d5c0a30ab80265f697f681387872b6763b2d1e
diff --git a/cmds/flatland/Main.cpp b/cmds/flatland/Main.cpp
index ec1e543..c47b0c8 100644
--- a/cmds/flatland/Main.cpp
+++ b/cmds/flatland/Main.cpp
@@ -16,6 +16,7 @@
 
 #define ATRACE_TAG ATRACE_TAG_ALWAYS
 
+#include <gui/GraphicBufferAlloc.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceControl.h>
 #include <gui/GLConsumer.h>