libgui: Add getLastQueuedBuffer to BufferQueue

Adds the ability to get the last buffer queued to a BufferQueue plus
its acquire fence.

Bug: 27708453
Change-Id: Iee39475740b40c854a5f46178b2934fd930e61b8
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
index 37b7aba..7e4e797 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
@@ -605,6 +605,12 @@
     return INVALID_OPERATION;
 }
 
+status_t VirtualDisplaySurface::getLastQueuedBuffer(
+        sp<GraphicBuffer>* /*outBuffer*/, sp<Fence>* /*outFence*/) {
+    ALOGE("getLastQueuedBuffer not supported on VirtualDisplaySurface");
+    return INVALID_OPERATION;
+}
+
 void VirtualDisplaySurface::updateQueueBufferOutput(
         const QueueBufferOutput& qbo) {
     uint32_t w, h, transformHint, numPendingBuffers;