Change GL references to GPU for getFrameTimestamps.

Test: Rename only.

Change-Id: Idaf7ab38f78f58aa8387823f47dac084e21eb1f0
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index d2dddba..0ad6287 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -649,7 +649,7 @@
         FrameEvent::LATCH,
         FrameEvent::FIRST_REFRESH_START,
         FrameEvent::LAST_REFRESH_START,
-        FrameEvent::GL_COMPOSITION_DONE,
+        FrameEvent::GPU_COMPOSITION_DONE,
         getHwComposer().presentFenceRepresentsStartOfScanout() ?
                 FrameEvent::DISPLAY_PRESENT : FrameEvent::DISPLAY_RETIRE,
         FrameEvent::DEQUEUE_READY,