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/BufferQueueLayer.cpp b/services/surfaceflinger/BufferQueueLayer.cpp
index a574549..0863a22 100644
--- a/services/surfaceflinger/BufferQueueLayer.cpp
+++ b/services/surfaceflinger/BufferQueueLayer.cpp
@@ -340,7 +340,7 @@
                                                FrameTracer::FrameEvent::LATCH);
 
         if (mQueueItems[0].surfaceFrame) {
-            mQueueItems[0].surfaceFrame->setActualEndTime(
+            mQueueItems[0].surfaceFrame->setAcquireFenceTime(
                     mQueueItems[0].item.mFenceTime->getSignalTime());
             mFlinger->mFrameTimeline->addSurfaceFrame(std::move(mQueueItems[0].surfaceFrame),
                                                       PresentState::Presented);