Revert "Get rid of IGraphicBufferAlloc"

This reverts commit 78491c9f694cb0767996503c629776a8eda950d7.

Change-Id: I78d5c0a30ab80265f697f681387872b6763b2d1e
diff --git a/libs/gui/GLConsumer.cpp b/libs/gui/GLConsumer.cpp
index c654f08..55e0d26 100644
--- a/libs/gui/GLConsumer.cpp
+++ b/libs/gui/GLConsumer.cpp
@@ -31,6 +31,7 @@
 
 #include <gui/BufferItem.h>
 #include <gui/GLConsumer.h>
+#include <gui/IGraphicBufferAlloc.h>
 #include <gui/ISurfaceComposer.h>
 #include <gui/SurfaceComposerClient.h>