SurfaceFlinger: rename FrameTimeline's setActualEndTime

Rename setActualEndTime to setAcquireFenceTime to better reflect what
the method keeps track of.

Change-Id: I1865a48d0cc4fbb55c4ec0fe2ff172fd31735ccb
Test: SF unit tests
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
index df2ef80..08801c9 100644
--- a/services/surfaceflinger/Layer.cpp
+++ b/services/surfaceflinger/Layer.cpp
@@ -894,7 +894,10 @@
         auto surfaceFrame =
                 mFlinger->mFrameTimeline->createSurfaceFrameForToken(mTransactionName, vsyncId);
         surfaceFrame->setActualQueueTime(stateToCommit->postTime);
-        surfaceFrame->setActualEndTime(stateToCommit->postTime);
+        // For transactions we set the acquire fence time to the post time as we
+        // don't have a buffer. For BufferStateLayer it is overridden in
+        // BufferStateLayer::applyPendingStates
+        surfaceFrame->setAcquireFenceTime(stateToCommit->postTime);
 
         mSurfaceFrame = std::move(surfaceFrame);
     }