Pass sp<Fence>s around instead of file descriptors

Change-Id: Iac70584a2207940730e8f803a543e4e9a4000c47
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
index fac6c3e..255b77f 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
@@ -70,9 +70,8 @@
     return mHwc.fbPost(mDisplayId, fence, mAcquiredBuffer);
 }
 
-void VirtualDisplaySurface::onFrameCommitted(int fenceFd) {
+void VirtualDisplaySurface::onFrameCommitted(const sp<Fence>& fence) {
     Mutex::Autolock lock(mMutex);
-    sp<Fence> fence(new Fence(fenceFd));
     if (mAcquiredBuffer != NULL) {
         status_t result = mSource->releaseBuffer(fence);
         ALOGE_IF(result != NO_ERROR, "VirtualDisplaySurface \"%s\": "