Revert "get rid of IGraphicBufferAlloc"

This reverts commit 1da94dfed674e94edc37cdc8ef68530520edf169.

Bug: 36176799
Bug: 36175706
Change-Id: I6dd5fe8df564f0efa4392a800fb316e27a05076e
diff --git a/cmds/flatland/GLHelper.h b/cmds/flatland/GLHelper.h
index d09463a..7a9e9e3 100644
--- a/cmds/flatland/GLHelper.h
+++ b/cmds/flatland/GLHelper.h
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <gui/GraphicBufferAlloc.h>
 #include <gui/GLConsumer.h>
 #include <gui/Surface.h>
 #include <gui/SurfaceControl.h>
@@ -74,6 +75,8 @@
 
     bool setUpShaders(const ShaderDesc* shaderDescs, size_t numShaders);
 
+    sp<GraphicBufferAlloc> mGraphicBufferAlloc;
+
     EGLDisplay mDisplay;
     EGLContext mContext;
     EGLSurface mDummySurface;