diff --git a/libs/vr/libvrflinger/Android.bp b/libs/vr/libvrflinger/Android.bp
index 6f3f1d6..776dd8e 100644
--- a/libs/vr/libvrflinger/Android.bp
+++ b/libs/vr/libvrflinger/Android.bp
@@ -20,7 +20,6 @@
     "display_surface.cpp",
     "hardware_composer.cpp",
     "vr_flinger.cpp",
-    "vsync_service.cpp",
 ]
 
 includeFiles = [ "include" ]
diff --git a/libs/vr/libvrflinger/display_service.h b/libs/vr/libvrflinger/display_service.h
index 3090bd1..6fad58e 100644
--- a/libs/vr/libvrflinger/display_service.h
+++ b/libs/vr/libvrflinger/display_service.h
@@ -60,11 +60,6 @@
   void SetDisplayConfigurationUpdateNotifier(
       DisplayConfigurationUpdateNotifier notifier);
 
-  using VSyncCallback = HardwareComposer::VSyncCallback;
-  void SetVSyncCallback(VSyncCallback callback) {
-    hardware_composer_.SetVSyncCallback(callback);
-  }
-
   void GrantDisplayOwnership() { hardware_composer_.Enable(); }
   void SeizeDisplayOwnership() { hardware_composer_.Disable(); }
   void OnBootFinished() { hardware_composer_.OnBootFinished(); }
diff --git a/libs/vr/libvrflinger/hardware_composer.cpp b/libs/vr/libvrflinger/hardware_composer.cpp
index 44ce78c..e98d592 100644
--- a/libs/vr/libvrflinger/hardware_composer.cpp
+++ b/libs/vr/libvrflinger/hardware_composer.cpp
@@ -1,5 +1,6 @@
 #include "hardware_composer.h"
 
+#include <binder/IServiceManager.h>
 #include <cutils/properties.h>
 #include <cutils/sched_policy.h>
 #include <fcntl.h>
@@ -52,6 +53,10 @@
 
 const char kUseExternalDisplayProperty[] = "persist.vr.use_external_display";
 
+// Surface flinger uses "VSYNC-sf" and "VSYNC-app" for its version of these
+// events. Name ours similarly.
+const char kVsyncTraceEventName[] = "VSYNC-vrflinger";
+
 // How long to wait after boot finishes before we turn the display off.
 constexpr int kBootFinishedDisplayOffTimeoutSec = 10;
 
@@ -131,6 +136,7 @@
   UpdatePostThreadState(PostThreadState::Quit, true);
   if (post_thread_.joinable())
     post_thread_.join();
+  composer_callback_->SetVsyncService(nullptr);
 }
 
 bool HardwareComposer::Initialize(
@@ -147,6 +153,13 @@
 
   primary_display_ = GetDisplayParams(composer, primary_display_id, true);
 
+  vsync_service_ = new VsyncService;
+  sp<IServiceManager> sm(defaultServiceManager());
+  auto result = sm->addService(String16(VsyncService::GetServiceName()),
+      vsync_service_, false);
+  LOG_ALWAYS_FATAL_IF(result != android::OK,
+      "addService(%s) failed", VsyncService::GetServiceName());
+
   post_thread_event_fd_.Reset(eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK));
   LOG_ALWAYS_FATAL_IF(
       !post_thread_event_fd_,
@@ -223,6 +236,7 @@
   LOG_ALWAYS_FATAL_IF(!composer_callback_->GotFirstHotplug(),
       "Registered composer callback but didn't get hotplug for primary"
       " display");
+  composer_callback_->SetVsyncService(vsync_service_);
 }
 
 void HardwareComposer::OnPostThreadResumed() {
@@ -242,7 +256,10 @@
   // Standalones only create the composer client once and then use SetPowerMode
   // to control the screen on pause/resume.
   if (!is_standalone_device_) {
-    composer_callback_ = nullptr;
+    if (composer_callback_ != nullptr) {
+      composer_callback_->SetVsyncService(nullptr);
+      composer_callback_ = nullptr;
+    }
     composer_.reset(nullptr);
   } else {
     EnableDisplay(*target_display_, false);
@@ -336,7 +353,6 @@
   // According to the documentation, this fence is signaled at the time of
   // vsync/DMA for physical displays.
   if (error == HWC::Error::None) {
-    ATRACE_INT("HardwareComposer: VsyncFence", present_fence);
     retire_fence_fds_.emplace_back(present_fence);
   } else {
     ATRACE_INT("HardwareComposer: PresentResult", error);
@@ -775,6 +791,11 @@
       std::unique_lock<std::mutex> lock(post_thread_mutex_);
       ALOGI("HardwareComposer::PostThread: Entering quiescent state.");
 
+      if (was_running) {
+        vsync_trace_parity_ = false;
+        ATRACE_INT(kVsyncTraceEventName, 0);
+      }
+
       // Tear down resources.
       OnPostThreadPaused();
       was_running = false;
@@ -848,6 +869,9 @@
       vsync_timestamp = status.get();
     }
 
+    vsync_trace_parity_ = !vsync_trace_parity_;
+    ATRACE_INT(kVsyncTraceEventName, vsync_trace_parity_ ? 1 : 0);
+
     // Advance the vsync counter only if the system is keeping up with hardware
     // vsync to give clients an indication of the delays.
     if (vsync_prediction_interval_ == 1)
@@ -867,11 +891,6 @@
       vsync_ring_->Publish(vsync);
     }
 
-    // Signal all of the vsync clients. Because absolute time is used for the
-    // wakeup time below, this can take a little time if necessary.
-    if (vsync_callback_)
-      vsync_callback_(vsync_timestamp, /*frame_time_estimate*/ 0, vsync_count_);
-
     {
       // Sleep until shortly before vsync.
       ATRACE_NAME("sleep");
@@ -1063,8 +1082,45 @@
            layers_.size());
 }
 
-void HardwareComposer::SetVSyncCallback(VSyncCallback callback) {
-  vsync_callback_ = callback;
+std::vector<sp<IVsyncCallback>>::const_iterator
+HardwareComposer::VsyncService::FindCallback(
+    const sp<IVsyncCallback>& callback) const {
+  sp<IBinder> binder = IInterface::asBinder(callback);
+  return std::find_if(callbacks_.cbegin(), callbacks_.cend(),
+                      [&](const sp<IVsyncCallback>& callback) {
+                        return IInterface::asBinder(callback) == binder;
+                      });
+}
+
+status_t HardwareComposer::VsyncService::registerCallback(
+    const sp<IVsyncCallback> callback) {
+  std::lock_guard<std::mutex> autolock(mutex_);
+  if (FindCallback(callback) == callbacks_.cend()) {
+    callbacks_.push_back(callback);
+  }
+  return NO_ERROR;
+}
+
+status_t HardwareComposer::VsyncService::unregisterCallback(
+    const sp<IVsyncCallback> callback) {
+  std::lock_guard<std::mutex> autolock(mutex_);
+  auto iter = FindCallback(callback);
+  if (iter != callbacks_.cend()) {
+    callbacks_.erase(iter);
+  }
+  return NO_ERROR;
+}
+
+void HardwareComposer::VsyncService::OnVsync(int64_t vsync_timestamp) {
+  ATRACE_NAME("VsyncService::OnVsync");
+  std::lock_guard<std::mutex> autolock(mutex_);
+  for (auto iter = callbacks_.begin(); iter != callbacks_.end();) {
+    if ((*iter)->onVsync(vsync_timestamp) == android::DEAD_OBJECT) {
+      iter = callbacks_.erase(iter);
+    } else {
+      ++iter;
+    }
+  }
 }
 
 Return<void> HardwareComposer::ComposerCallback::onHotplug(
@@ -1123,16 +1179,26 @@
 
 Return<void> HardwareComposer::ComposerCallback::onVsync(Hwc2::Display display,
                                                          int64_t timestamp) {
+  TRACE_FORMAT("vsync_callback|display=%" PRIu64 ";timestamp=%" PRId64 "|",
+               display, timestamp);
+  std::lock_guard<std::mutex> lock(mutex_);
   DisplayInfo* display_info = GetDisplayInfo(display);
   if (display_info) {
-    TRACE_FORMAT("vsync_callback|display=%" PRIu64 ";timestamp=%" PRId64 "|",
-                 display, timestamp);
     display_info->callback_vsync_timestamp = timestamp;
   }
+  if (primary_display_.id == display && vsync_service_ != nullptr) {
+    vsync_service_->OnVsync(timestamp);
+  }
 
   return Void();
 }
 
+void HardwareComposer::ComposerCallback::SetVsyncService(
+    const sp<VsyncService>& vsync_service) {
+  std::lock_guard<std::mutex> lock(mutex_);
+  vsync_service_ = vsync_service;
+}
+
 HardwareComposer::ComposerCallback::Displays
 HardwareComposer::ComposerCallback::GetDisplays() {
   std::lock_guard<std::mutex> lock(mutex_);
@@ -1149,6 +1215,7 @@
 
 Status<int64_t> HardwareComposer::ComposerCallback::GetVsyncTime(
     hwc2_display_t display) {
+  std::lock_guard<std::mutex> autolock(mutex_);
   DisplayInfo* display_info = GetDisplayInfo(display);
   if (!display_info) {
     ALOGW("Attempt to get vsync time for unknown display %" PRIu64, display);
@@ -1160,7 +1227,6 @@
   if (!event_fd) {
     // Fall back to returning the last timestamp returned by the vsync
     // callback.
-    std::lock_guard<std::mutex> autolock(mutex_);
     return display_info->callback_vsync_timestamp;
   }
 
diff --git a/libs/vr/libvrflinger/hardware_composer.h b/libs/vr/libvrflinger/hardware_composer.h
index 1d8d463..80fa7ac 100644
--- a/libs/vr/libvrflinger/hardware_composer.h
+++ b/libs/vr/libvrflinger/hardware_composer.h
@@ -24,6 +24,7 @@
 #include <pdx/rpc/variant.h>
 #include <private/dvr/buffer_hub_client.h>
 #include <private/dvr/shared_buffer_helpers.h>
+#include <private/dvr/vsync_service.h>
 
 #include "acquired_buffer.h"
 #include "display_surface.h"
@@ -300,8 +301,6 @@
 // will access the state and whether it needs to be synchronized.
 class HardwareComposer {
  public:
-  // Type for vsync callback.
-  using VSyncCallback = std::function<void(int64_t, int64_t, uint32_t)>;
   using RequestDisplayCallback = std::function<void(bool)>;
 
   HardwareComposer();
@@ -325,8 +324,6 @@
 
   std::string Dump();
 
-  void SetVSyncCallback(VSyncCallback callback);
-
   const DisplayParams& GetPrimaryDisplayParams() const {
     return primary_display_;
   }
@@ -350,6 +347,18 @@
   // on/off. Returns true on success, false on failure.
   bool EnableDisplay(const DisplayParams& display, bool enabled);
 
+  class VsyncService : public BnVsyncService {
+   public:
+    status_t registerCallback(const sp<IVsyncCallback> callback) override;
+    status_t unregisterCallback(const sp<IVsyncCallback> callback) override;
+    void OnVsync(int64_t vsync_timestamp);
+   private:
+    std::vector<sp<IVsyncCallback>>::const_iterator FindCallback(
+        const sp<IVsyncCallback>& callback) const;
+    std::mutex mutex_;
+    std::vector<sp<IVsyncCallback>> callbacks_;
+  };
+
   class ComposerCallback : public Hwc2::IComposerCallback {
    public:
     ComposerCallback() = default;
@@ -360,6 +369,7 @@
                                    int64_t timestamp) override;
 
     bool GotFirstHotplug() { return got_first_hotplug_; }
+    void SetVsyncService(const sp<VsyncService>& vsync_service);
 
     struct Displays {
       hwc2_display_t primary_display = 0;
@@ -385,6 +395,7 @@
     DisplayInfo primary_display_;
     std::optional<DisplayInfo> external_display_;
     bool external_display_was_hotplugged_ = false;
+    sp<VsyncService> vsync_service_;
   };
 
   HWC::Error Validate(hwc2_display_t display);
@@ -484,9 +495,6 @@
   // vector must be sorted by surface_id in ascending order.
   std::vector<Layer> layers_;
 
-  // Handler to hook vsync events outside of this class.
-  VSyncCallback vsync_callback_;
-
   // The layer posting thread. This thread wakes up a short time before vsync to
   // hand buffers to hardware composer.
   std::thread post_thread_;
@@ -534,6 +542,9 @@
   DvrConfig post_thread_config_;
   std::mutex shared_config_mutex_;
 
+  bool vsync_trace_parity_ = false;
+  sp<VsyncService> vsync_service_;
+
   static constexpr int kPostThreadInterrupted = 1;
 
   HardwareComposer(const HardwareComposer&) = delete;
diff --git a/libs/vr/libvrflinger/vr_flinger.cpp b/libs/vr/libvrflinger/vr_flinger.cpp
index 26aed4f..b57383a 100644
--- a/libs/vr/libvrflinger/vr_flinger.cpp
+++ b/libs/vr/libvrflinger/vr_flinger.cpp
@@ -23,7 +23,6 @@
 #include "DisplayHardware/ComposerHal.h"
 #include "display_manager_service.h"
 #include "display_service.h"
-#include "vsync_service.h"
 
 namespace android {
 namespace dvr {
@@ -85,16 +84,6 @@
   CHECK_ERROR(!service, error, "Failed to create display manager service.");
   dispatcher_->AddService(service);
 
-  service = android::dvr::VSyncService::Create();
-  CHECK_ERROR(!service, error, "Failed to create vsync service.");
-  dispatcher_->AddService(service);
-
-  display_service_->SetVSyncCallback(
-      std::bind(&android::dvr::VSyncService::VSyncEvent,
-                std::static_pointer_cast<android::dvr::VSyncService>(service),
-                std::placeholders::_1, std::placeholders::_2,
-                std::placeholders::_3));
-
   dispatcher_thread_ = std::thread([this]() {
     prctl(PR_SET_NAME, reinterpret_cast<unsigned long>("VrDispatch"), 0, 0, 0);
     ALOGI("Entering message loop.");
diff --git a/libs/vr/libvrflinger/vsync_service.cpp b/libs/vr/libvrflinger/vsync_service.cpp
deleted file mode 100644
index b8d8b08..0000000
--- a/libs/vr/libvrflinger/vsync_service.cpp
+++ /dev/null
@@ -1,212 +0,0 @@
-#include "vsync_service.h"
-
-#include <hardware/hwcomposer.h>
-#include <log/log.h>
-#include <poll.h>
-#include <sys/prctl.h>
-#include <time.h>
-#include <utils/Trace.h>
-
-#include <dvr/dvr_display_types.h>
-#include <pdx/default_transport/service_endpoint.h>
-#include <private/dvr/clock_ns.h>
-#include <private/dvr/display_protocol.h>
-
-using android::dvr::display::VSyncProtocol;
-using android::dvr::display::VSyncSchedInfo;
-using android::pdx::Channel;
-using android::pdx::Message;
-using android::pdx::MessageInfo;
-using android::pdx::default_transport::Endpoint;
-using android::pdx::rpc::DispatchRemoteMethod;
-
-namespace android {
-namespace dvr {
-
-VSyncService::VSyncService()
-    : BASE("VSyncService", Endpoint::Create(VSyncProtocol::kClientPath)),
-      last_vsync_(0),
-      current_vsync_(0),
-      compositor_time_ns_(0),
-      current_vsync_count_(0) {}
-
-VSyncService::~VSyncService() {}
-
-void VSyncService::VSyncEvent(int64_t timestamp_ns,
-                              int64_t compositor_time_ns,
-                              uint32_t vsync_count) {
-  ATRACE_NAME("VSyncService::VSyncEvent");
-  std::lock_guard<std::mutex> autolock(mutex_);
-
-  last_vsync_ = current_vsync_;
-  current_vsync_ = timestamp_ns;
-  compositor_time_ns_ = compositor_time_ns;
-  current_vsync_count_ = vsync_count;
-
-  NotifyWaiters();
-  UpdateClients();
-}
-
-std::shared_ptr<Channel> VSyncService::OnChannelOpen(pdx::Message& message) {
-  const MessageInfo& info = message.GetInfo();
-
-  auto client = std::make_shared<VSyncChannel>(*this, info.pid, info.cid);
-  AddClient(client);
-
-  return client;
-}
-
-void VSyncService::OnChannelClose(pdx::Message& /*message*/,
-                                  const std::shared_ptr<Channel>& channel) {
-  auto client = std::static_pointer_cast<VSyncChannel>(channel);
-  if (!client) {
-    ALOGW("WARNING: VSyncChannel was NULL!!!\n");
-    return;
-  }
-
-  RemoveClient(client);
-}
-
-void VSyncService::AddWaiter(pdx::Message& message) {
-  std::lock_guard<std::mutex> autolock(mutex_);
-  std::unique_ptr<VSyncWaiter> waiter(new VSyncWaiter(message));
-  waiters_.push_back(std::move(waiter));
-}
-
-void VSyncService::AddClient(const std::shared_ptr<VSyncChannel>& client) {
-  std::lock_guard<std::mutex> autolock(mutex_);
-  clients_.push_back(client);
-}
-
-void VSyncService::RemoveClient(const std::shared_ptr<VSyncChannel>& client) {
-  std::lock_guard<std::mutex> autolock(mutex_);
-  clients_.remove(client);
-}
-
-// Private. Assumes mutex is held.
-void VSyncService::NotifyWaiters() {
-  ATRACE_NAME("VSyncService::NotifyWaiters");
-  auto first = waiters_.begin();
-  auto last = waiters_.end();
-
-  while (first != last) {
-    (*first)->Notify(current_vsync_);
-    waiters_.erase(first++);
-  }
-}
-
-// Private. Assumes mutex is held.
-void VSyncService::UpdateClients() {
-  ATRACE_NAME("VSyncService::UpdateClients");
-  auto first = clients_.begin();
-  auto last = clients_.end();
-
-  while (first != last) {
-    (*first)->Signal();
-    first++;
-  }
-}
-
-pdx::Status<void> VSyncService::HandleMessage(pdx::Message& message) {
-  ATRACE_NAME("VSyncService::HandleMessage");
-  switch (message.GetOp()) {
-    case VSyncProtocol::Wait::Opcode:
-      AddWaiter(message);
-      return {};
-
-    case VSyncProtocol::GetLastTimestamp::Opcode:
-      DispatchRemoteMethod<VSyncProtocol::GetLastTimestamp>(
-          *this, &VSyncService::OnGetLastTimestamp, message);
-      return {};
-
-    case VSyncProtocol::GetSchedInfo::Opcode:
-      DispatchRemoteMethod<VSyncProtocol::GetSchedInfo>(
-          *this, &VSyncService::OnGetSchedInfo, message);
-      return {};
-
-    case VSyncProtocol::Acknowledge::Opcode:
-      DispatchRemoteMethod<VSyncProtocol::Acknowledge>(
-          *this, &VSyncService::OnAcknowledge, message);
-      return {};
-
-    default:
-      return Service::HandleMessage(message);
-  }
-}
-
-pdx::Status<int64_t> VSyncService::OnGetLastTimestamp(pdx::Message& message) {
-  auto client = std::static_pointer_cast<VSyncChannel>(message.GetChannel());
-  std::lock_guard<std::mutex> autolock(mutex_);
-
-  // Getting the timestamp has the side effect of ACKing.
-  client->Ack();
-  return {current_vsync_};
-}
-
-pdx::Status<VSyncSchedInfo> VSyncService::OnGetSchedInfo(
-    pdx::Message& message) {
-  auto client = std::static_pointer_cast<VSyncChannel>(message.GetChannel());
-  std::lock_guard<std::mutex> autolock(mutex_);
-
-  // Getting the timestamp has the side effect of ACKing.
-  client->Ack();
-
-  uint32_t next_vsync_count = current_vsync_count_ + 1;
-  int64_t current_time = GetSystemClockNs();
-  int64_t vsync_period_ns = 0;
-  int64_t next_warp;
-  if (current_vsync_ == 0 || last_vsync_ == 0) {
-    // Handle startup when current_vsync_ or last_vsync_ are 0.
-    // Normally should not happen because vsync_service is running before
-    // applications, but in case it does a sane time prevents applications
-    // from malfunctioning.
-    vsync_period_ns = 20000000;
-    next_warp = current_time;
-  } else {
-    // TODO(jbates) When we have an accurate reading of the true vsync
-    // period, use that instead of this estimated value.
-    vsync_period_ns = current_vsync_ - last_vsync_;
-    // Clamp the period, because when there are no surfaces the last_vsync_
-    // value will get stale. Note this is temporary and goes away as soon
-    // as we have an accurate vsync period reported by the system.
-    vsync_period_ns = std::min(vsync_period_ns, INT64_C(20000000));
-    next_warp = current_vsync_ + vsync_period_ns - compositor_time_ns_;
-    // If the request missed the present window, move up to the next vsync.
-    if (current_time > next_warp) {
-      next_warp += vsync_period_ns;
-      ++next_vsync_count;
-    }
-  }
-
-  return {{vsync_period_ns, next_warp, next_vsync_count}};
-}
-
-pdx::Status<void> VSyncService::OnAcknowledge(pdx::Message& message) {
-  auto client = std::static_pointer_cast<VSyncChannel>(message.GetChannel());
-  std::lock_guard<std::mutex> autolock(mutex_);
-  client->Ack();
-  return {};
-}
-
-void VSyncWaiter::Notify(int64_t timestamp) {
-  timestamp_ = timestamp;
-  DispatchRemoteMethod<VSyncProtocol::Wait>(*this, &VSyncWaiter::OnWait,
-                                            message_);
-}
-
-pdx::Status<int64_t> VSyncWaiter::OnWait(pdx::Message& /*message*/) {
-  return {timestamp_};
-}
-
-void VSyncChannel::Ack() {
-  ALOGD_IF(TRACE > 1, "VSyncChannel::Ack: pid=%d cid=%d\n", pid_, cid_);
-  service_.ModifyChannelEvents(cid_, POLLPRI, 0);
-}
-
-void VSyncChannel::Signal() {
-  ALOGD_IF(TRACE > 1, "VSyncChannel::Signal: pid=%d cid=%d\n", pid_, cid_);
-  service_.ModifyChannelEvents(cid_, 0, POLLPRI);
-}
-
-}  // namespace dvr
-}  // namespace android
diff --git a/libs/vr/libvrflinger/vsync_service.h b/libs/vr/libvrflinger/vsync_service.h
deleted file mode 100644
index 822f02b..0000000
--- a/libs/vr/libvrflinger/vsync_service.h
+++ /dev/null
@@ -1,107 +0,0 @@
-#ifndef ANDROID_DVR_SERVICES_DISPLAYD_VSYNC_SERVICE_H_
-#define ANDROID_DVR_SERVICES_DISPLAYD_VSYNC_SERVICE_H_
-
-#include <pdx/service.h>
-
-#include <list>
-#include <memory>
-#include <mutex>
-#include <thread>
-
-#include "display_service.h"
-
-namespace android {
-namespace dvr {
-
-// VSyncWaiter encapsulates a client blocked waiting for the next vsync.
-// It is used to enqueue the Message to reply to when the next vsync event
-// occurs.
-class VSyncWaiter {
- public:
-  explicit VSyncWaiter(pdx::Message& message) : message_(std::move(message)) {}
-
-  void Notify(int64_t timestamp);
-
- private:
-  pdx::Status<int64_t> OnWait(pdx::Message& message);
-
-  pdx::Message message_;
-  int64_t timestamp_ = 0;
-
-  VSyncWaiter(const VSyncWaiter&) = delete;
-  void operator=(const VSyncWaiter&) = delete;
-};
-
-// VSyncChannel manages the service-side per-client context for each client
-// using the service.
-class VSyncChannel : public pdx::Channel {
- public:
-  VSyncChannel(pdx::Service& service, int pid, int cid)
-      : service_(service), pid_(pid), cid_(cid) {}
-
-  void Ack();
-  void Signal();
-
- private:
-  pdx::Service& service_;
-  pid_t pid_;
-  int cid_;
-
-  VSyncChannel(const VSyncChannel&) = delete;
-  void operator=(const VSyncChannel&) = delete;
-};
-
-// VSyncService implements the displayd vsync service over ServiceFS.
-class VSyncService : public pdx::ServiceBase<VSyncService> {
- public:
-  ~VSyncService() override;
-
-  pdx::Status<void> HandleMessage(pdx::Message& message) override;
-
-  std::shared_ptr<pdx::Channel> OnChannelOpen(pdx::Message& message) override;
-  void OnChannelClose(pdx::Message& message,
-                      const std::shared_ptr<pdx::Channel>& channel) override;
-
-  // Called by the hardware composer HAL, or similar, whenever a vsync event
-  // occurs on the primary display. |compositor_time_ns| is the number of ns
-  // before the next vsync when the compositor will preempt the GPU to do EDS
-  // and lens warp.
-  void VSyncEvent(int64_t timestamp_ns, int64_t compositor_time_ns,
-                  uint32_t vsync_count);
-
- private:
-  friend BASE;
-
-  VSyncService();
-
-  pdx::Status<int64_t> OnGetLastTimestamp(pdx::Message& message);
-  pdx::Status<display::VSyncSchedInfo> OnGetSchedInfo(pdx::Message& message);
-  pdx::Status<void> OnAcknowledge(pdx::Message& message);
-
-  void NotifierThreadFunction();
-
-  void AddWaiter(pdx::Message& message);
-  void NotifyWaiters();
-  void UpdateClients();
-
-  void AddClient(const std::shared_ptr<VSyncChannel>& client);
-  void RemoveClient(const std::shared_ptr<VSyncChannel>& client);
-
-  int64_t last_vsync_;
-  int64_t current_vsync_;
-  int64_t compositor_time_ns_;
-  uint32_t current_vsync_count_;
-
-  std::mutex mutex_;
-
-  std::list<std::unique_ptr<VSyncWaiter>> waiters_;
-  std::list<std::shared_ptr<VSyncChannel>> clients_;
-
-  VSyncService(const VSyncService&) = delete;
-  void operator=(VSyncService&) = delete;
-};
-
-}  // namespace dvr
-}  // namespace android
-
-#endif  // ANDROID_DVR_SERVICES_DISPLAYD_VSYNC_SERVICE_H_