diff --git a/services/surfaceflinger/Scheduler/DispSyncSource.h b/services/surfaceflinger/Scheduler/DispSyncSource.h
index 740c8c4..536464e 100644
--- a/services/surfaceflinger/Scheduler/DispSyncSource.h
+++ b/services/surfaceflinger/Scheduler/DispSyncSource.h
@@ -32,6 +32,7 @@
     ~DispSyncSource() override = default;
 
     // The following methods are implementation of VSyncSource.
+    const char* getName() const override { return mName; }
     void setVSyncEnabled(bool enable) override;
     void setCallback(VSyncSource::Callback* callback) override;
     void setPhaseOffset(nsecs_t phaseOffset) override;
diff --git a/services/surfaceflinger/Scheduler/EventThread.cpp b/services/surfaceflinger/Scheduler/EventThread.cpp
index 9d1f777..8d9adc8 100644
--- a/services/surfaceflinger/Scheduler/EventThread.cpp
+++ b/services/surfaceflinger/Scheduler/EventThread.cpp
@@ -154,23 +154,11 @@
 
 namespace impl {
 
-EventThread::EventThread(std::unique_ptr<VSyncSource> src,
-                         InterceptVSyncsCallback interceptVSyncsCallback, const char* threadName)
-      : EventThread(nullptr, std::move(src), std::move(interceptVSyncsCallback), threadName) {}
-
-EventThread::EventThread(VSyncSource* src, InterceptVSyncsCallback interceptVSyncsCallback,
-                         const char* threadName)
-      : EventThread(src, nullptr, std::move(interceptVSyncsCallback), threadName) {}
-
-EventThread::EventThread(VSyncSource* src, std::unique_ptr<VSyncSource> uniqueSrc,
-                         InterceptVSyncsCallback interceptVSyncsCallback, const char* threadName)
-      : mVSyncSource(src),
-        mVSyncSourceUnique(std::move(uniqueSrc)),
+EventThread::EventThread(std::unique_ptr<VSyncSource> vsyncSource,
+                         InterceptVSyncsCallback interceptVSyncsCallback)
+      : mVSyncSource(std::move(vsyncSource)),
         mInterceptVSyncsCallback(std::move(interceptVSyncsCallback)),
-        mThreadName(threadName) {
-    if (src == nullptr) {
-        mVSyncSource = mVSyncSourceUnique.get();
-    }
+        mThreadName(mVSyncSource->getName()) {
     mVSyncSource->setCallback(this);
 
     mThread = std::thread([this]() NO_THREAD_SAFETY_ANALYSIS {
@@ -178,7 +166,7 @@
         threadMain(lock);
     });
 
-    pthread_setname_np(mThread.native_handle(), threadName);
+    pthread_setname_np(mThread.native_handle(), mThreadName);
 
     pid_t tid = pthread_gettid_np(mThread.native_handle());
 
diff --git a/services/surfaceflinger/Scheduler/EventThread.h b/services/surfaceflinger/Scheduler/EventThread.h
index dd23b88..a029586 100644
--- a/services/surfaceflinger/Scheduler/EventThread.h
+++ b/services/surfaceflinger/Scheduler/EventThread.h
@@ -62,6 +62,8 @@
     };
 
     virtual ~VSyncSource() {}
+
+    virtual const char* getName() const = 0;
     virtual void setVSyncEnabled(bool enable) = 0;
     virtual void setCallback(Callback* callback) = 0;
     virtual void setPhaseOffset(nsecs_t phaseOffset) = 0;
@@ -126,9 +128,7 @@
 public:
     using InterceptVSyncsCallback = std::function<void(nsecs_t)>;
 
-    // TODO(b/128863962): Once the Scheduler is complete this constructor will become obsolete.
-    EventThread(VSyncSource*, InterceptVSyncsCallback, const char* threadName);
-    EventThread(std::unique_ptr<VSyncSource>, InterceptVSyncsCallback, const char* threadName);
+    EventThread(std::unique_ptr<VSyncSource>, InterceptVSyncsCallback);
     ~EventThread();
 
     sp<EventThreadConnection> createEventConnection(
@@ -157,10 +157,6 @@
 
     using DisplayEventConsumers = std::vector<sp<EventThreadConnection>>;
 
-    // TODO(b/128863962): Once the Scheduler is complete this constructor will become obsolete.
-    EventThread(VSyncSource* src, std::unique_ptr<VSyncSource> uniqueSrc,
-                InterceptVSyncsCallback interceptVSyncsCallback, const char* threadName);
-
     void threadMain(std::unique_lock<std::mutex>& lock) REQUIRES(mMutex);
 
     bool shouldConsumeEvent(const DisplayEventReceiver::Event& event,
@@ -174,9 +170,7 @@
     // Implements VSyncSource::Callback
     void onVSyncEvent(nsecs_t timestamp) override;
 
-    // TODO(b/128863962): Once the Scheduler is complete this pointer will become obsolete.
-    VSyncSource* mVSyncSource GUARDED_BY(mMutex) = nullptr;
-    std::unique_ptr<VSyncSource> mVSyncSourceUnique GUARDED_BY(mMutex) = nullptr;
+    const std::unique_ptr<VSyncSource> mVSyncSource GUARDED_BY(mMutex);
 
     const InterceptVSyncsCallback mInterceptVSyncsCallback;
     const char* const mThreadName;
diff --git a/services/surfaceflinger/Scheduler/InjectVSyncSource.h b/services/surfaceflinger/Scheduler/InjectVSyncSource.h
index 90609af..6c502e6 100644
--- a/services/surfaceflinger/Scheduler/InjectVSyncSource.h
+++ b/services/surfaceflinger/Scheduler/InjectVSyncSource.h
@@ -42,6 +42,7 @@
         }
     }
 
+    const char* getName() const override { return "inject"; }
     void setVSyncEnabled(bool) override {}
     void setPhaseOffset(nsecs_t) override {}
     void pauseVsyncCallback(bool) {}
@@ -51,4 +52,4 @@
     VSyncSource::Callback* mCallback GUARDED_BY(mCallbackMutex) = nullptr;
 };
 
-} // namespace android
\ No newline at end of file
+} // namespace android
diff --git a/services/surfaceflinger/Scheduler/MessageQueue.cpp b/services/surfaceflinger/Scheduler/MessageQueue.cpp
index fcb307f..5318b00 100644
--- a/services/surfaceflinger/Scheduler/MessageQueue.cpp
+++ b/services/surfaceflinger/Scheduler/MessageQueue.cpp
@@ -85,24 +85,6 @@
     mHandler = new Handler(*this);
 }
 
-void MessageQueue::setEventThread(android::EventThread* eventThread,
-                                  ResyncCallback resyncCallback) {
-    if (mEventThread == eventThread) {
-        return;
-    }
-
-    if (mEventTube.getFd() >= 0) {
-        mLooper->removeFd(mEventTube.getFd());
-    }
-
-    mEventThread = eventThread;
-    mEvents = eventThread->createEventConnection(std::move(resyncCallback),
-                                                 ISurfaceComposer::eConfigChangedSuppress);
-    mEvents->stealReceiveChannel(&mEventTube);
-    mLooper->addFd(mEventTube.getFd(), 0, Looper::EVENT_INPUT, MessageQueue::cb_eventReceiver,
-                   this);
-}
-
 void MessageQueue::setEventConnection(const sp<EventThreadConnection>& connection) {
     if (mEventTube.getFd() >= 0) {
         mLooper->removeFd(mEventTube.getFd());
diff --git a/services/surfaceflinger/Scheduler/MessageQueue.h b/services/surfaceflinger/Scheduler/MessageQueue.h
index 0b2206d..fcfc4aa 100644
--- a/services/surfaceflinger/Scheduler/MessageQueue.h
+++ b/services/surfaceflinger/Scheduler/MessageQueue.h
@@ -85,8 +85,6 @@
     virtual ~MessageQueue();
 
     virtual void init(const sp<SurfaceFlinger>& flinger) = 0;
-    // TODO(b/128863962): Remove this function once everything is migrated to Scheduler.
-    virtual void setEventThread(EventThread* events, ResyncCallback resyncCallback) = 0;
     virtual void setEventConnection(const sp<EventThreadConnection>& connection) = 0;
     virtual void waitMessage() = 0;
     virtual status_t postMessage(const sp<MessageBase>& message, nsecs_t reltime = 0) = 0;
@@ -115,7 +113,6 @@
 
     sp<SurfaceFlinger> mFlinger;
     sp<Looper> mLooper;
-    android::EventThread* mEventThread;
     sp<EventThreadConnection> mEvents;
     gui::BitTube mEventTube;
     sp<Handler> mHandler;
@@ -126,7 +123,6 @@
 public:
     ~MessageQueue() override = default;
     void init(const sp<SurfaceFlinger>& flinger) override;
-    void setEventThread(android::EventThread* events, ResyncCallback resyncCallback) override;
     void setEventConnection(const sp<EventThreadConnection>& connection) override;
 
     void waitMessage() override;
diff --git a/services/surfaceflinger/Scheduler/Scheduler.cpp b/services/surfaceflinger/Scheduler/Scheduler.cpp
index add56fc..d60e101 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.cpp
+++ b/services/surfaceflinger/Scheduler/Scheduler.cpp
@@ -41,6 +41,7 @@
 #include "DispSyncSource.h"
 #include "EventControlThread.h"
 #include "EventThread.h"
+#include "InjectVSyncSource.h"
 #include "OneShotTimer.h"
 #include "SchedulerUtils.h"
 #include "SurfaceFlingerProperties.h"
@@ -116,11 +117,20 @@
     return *mPrimaryDispSync;
 }
 
+std::unique_ptr<VSyncSource> Scheduler::makePrimaryDispSyncSource(
+        const char* name, nsecs_t phaseOffsetNs, nsecs_t offsetThresholdForNextVsync) {
+    return std::make_unique<DispSyncSource>(mPrimaryDispSync.get(), phaseOffsetNs,
+                                            offsetThresholdForNextVsync, true /* traceVsync */,
+                                            name);
+}
+
 Scheduler::ConnectionHandle Scheduler::createConnection(
         const char* connectionName, nsecs_t phaseOffsetNs, nsecs_t offsetThresholdForNextVsync,
         impl::EventThread::InterceptVSyncsCallback interceptCallback) {
-    auto eventThread = makeEventThread(connectionName, phaseOffsetNs, offsetThresholdForNextVsync,
-                                       std::move(interceptCallback));
+    auto vsyncSource =
+            makePrimaryDispSyncSource(connectionName, phaseOffsetNs, offsetThresholdForNextVsync);
+    auto eventThread = std::make_unique<impl::EventThread>(std::move(vsyncSource),
+                                                           std::move(interceptCallback));
     return createConnection(std::move(eventThread));
 }
 
@@ -135,16 +145,6 @@
     return handle;
 }
 
-std::unique_ptr<EventThread> Scheduler::makeEventThread(
-        const char* connectionName, nsecs_t phaseOffsetNs, nsecs_t offsetThresholdForNextVsync,
-        impl::EventThread::InterceptVSyncsCallback&& interceptCallback) {
-    auto source = std::make_unique<DispSyncSource>(mPrimaryDispSync.get(), phaseOffsetNs,
-                                                   offsetThresholdForNextVsync,
-                                                   true /* traceVsync */, connectionName);
-    return std::make_unique<impl::EventThread>(std::move(source), std::move(interceptCallback),
-                                               connectionName);
-}
-
 sp<EventThreadConnection> Scheduler::createConnectionInternal(
         EventThread* eventThread, ISurfaceComposer::ConfigChanged configChanged) {
     return eventThread->createEventConnection([&] { resync(); }, configChanged);
@@ -156,11 +156,6 @@
     return createConnectionInternal(mConnections[handle].thread.get(), configChanged);
 }
 
-EventThread* Scheduler::getEventThread(ConnectionHandle handle) {
-    RETURN_IF_INVALID_HANDLE(handle, nullptr);
-    return mConnections[handle].thread.get();
-}
-
 sp<EventThreadConnection> Scheduler::getEventConnection(ConnectionHandle handle) {
     RETURN_IF_INVALID_HANDLE(handle, nullptr);
     return mConnections[handle].connection;
@@ -203,6 +198,37 @@
     stats->vsyncPeriod = mPrimaryDispSync->getPeriod();
 }
 
+Scheduler::ConnectionHandle Scheduler::enableVSyncInjection(bool enable) {
+    if (mInjectVSyncs == enable) {
+        return {};
+    }
+
+    ALOGV("%s VSYNC injection", enable ? "Enabling" : "Disabling");
+
+    if (!mInjectorConnectionHandle) {
+        auto vsyncSource = std::make_unique<InjectVSyncSource>();
+        mVSyncInjector = vsyncSource.get();
+
+        auto eventThread =
+                std::make_unique<impl::EventThread>(std::move(vsyncSource),
+                                                    impl::EventThread::InterceptVSyncsCallback());
+
+        mInjectorConnectionHandle = createConnection(std::move(eventThread));
+    }
+
+    mInjectVSyncs = enable;
+    return mInjectorConnectionHandle;
+}
+
+bool Scheduler::injectVSync(nsecs_t when) {
+    if (!mInjectVSyncs || !mVSyncInjector) {
+        return false;
+    }
+
+    mVSyncInjector->onInjectSyncEvent(when);
+    return true;
+}
+
 void Scheduler::enableHardwareVsync() {
     std::lock_guard<std::mutex> lock(mHWVsyncLock);
     if (!mPrimaryHWVsyncEnabled && mHWVsyncAvailable) {
diff --git a/services/surfaceflinger/Scheduler/Scheduler.h b/services/surfaceflinger/Scheduler/Scheduler.h
index 0c8c335..a5971fe 100644
--- a/services/surfaceflinger/Scheduler/Scheduler.h
+++ b/services/surfaceflinger/Scheduler/Scheduler.h
@@ -36,6 +36,7 @@
 
 class DispSync;
 class FenceTime;
+class InjectVSyncSource;
 struct DisplayStateInfo;
 
 class Scheduler {
@@ -63,7 +64,6 @@
     sp<IDisplayEventConnection> createDisplayEventConnection(ConnectionHandle,
                                                              ISurfaceComposer::ConfigChanged);
 
-    EventThread* getEventThread(ConnectionHandle);
     sp<EventThreadConnection> getEventConnection(ConnectionHandle);
 
     void onHotplugReceived(ConnectionHandle, PhysicalDisplayId, bool connected);
@@ -77,6 +77,12 @@
 
     void getDisplayStatInfo(DisplayStatInfo* stats);
 
+    // Returns injector handle if injection has toggled, or an invalid handle otherwise.
+    ConnectionHandle enableVSyncInjection(bool enable);
+
+    // Returns false if injection is disabled.
+    bool injectVSync(nsecs_t when);
+
     void enableHardwareVsync();
     void disableHardwareVsync(bool makeUnavailable);
 
@@ -138,12 +144,10 @@
     Scheduler(std::unique_ptr<DispSync>, std::unique_ptr<EventControlThread>,
               const scheduler::RefreshRateConfigs&);
 
-    // Creates a connection on the given EventThread and forwards the given callbacks.
-    std::unique_ptr<EventThread> makeEventThread(const char* connectionName, nsecs_t phaseOffsetNs,
-                                                 nsecs_t offsetThresholdForNextVsync,
-                                                 impl::EventThread::InterceptVSyncsCallback&&);
+    std::unique_ptr<VSyncSource> makePrimaryDispSyncSource(const char* name, nsecs_t phaseOffsetNs,
+                                                           nsecs_t offsetThresholdForNextVsync);
 
-    // Create a connection on the given EventThread and forward the resync callback.
+    // Create a connection on the given EventThread.
     ConnectionHandle createConnection(std::unique_ptr<EventThread>);
     sp<EventThreadConnection> createConnectionInternal(EventThread*,
                                                        ISurfaceComposer::ConfigChanged);
@@ -173,6 +177,10 @@
     ConnectionHandle::Id mNextConnectionHandleId = 0;
     std::unordered_map<ConnectionHandle, Connection> mConnections;
 
+    bool mInjectVSyncs = false;
+    InjectVSyncSource* mVSyncInjector = nullptr;
+    ConnectionHandle mInjectorConnectionHandle;
+
     std::mutex mHWVsyncLock;
     bool mPrimaryHWVsyncEnabled GUARDED_BY(mHWVsyncLock) = false;
     bool mHWVsyncAvailable GUARDED_BY(mHWVsyncLock) = false;