libgui: Add missing FenceTime header to GLConsumer

GLConsumer had a missing dependency on FenceTime which was hidden by
coincidental includes in other files. This adds the proper include.

Test: GLConsumer compiles
Change-Id: Ib96522787fa22746e4aeb2cf047bfd667869add6
diff --git a/include/gui/GLConsumer.h b/include/gui/GLConsumer.h
index 51d7666..2cf6162 100644
--- a/include/gui/GLConsumer.h
+++ b/include/gui/GLConsumer.h
@@ -23,6 +23,7 @@
 #include <gui/BufferQueueDefs.h>
 #include <gui/ConsumerBase.h>
 
+#include <ui/FenceTime.h>
 #include <ui/GraphicBuffer.h>
 
 #include <utils/String8.h>