Making BrightnessSynchronizer operate on Display thread

Bug: b/349606418 b/345623960
Test: manual testing
Change-Id: I0f43db74d629a47213744fbba53e7ea85c5253ec
Flag: EXEMPT trivial change
diff --git a/core/java/com/android/internal/display/BrightnessSynchronizer.java b/core/java/com/android/internal/display/BrightnessSynchronizer.java
index 0068490..9f5ed65 100644
--- a/core/java/com/android/internal/display/BrightnessSynchronizer.java
+++ b/core/java/com/android/internal/display/BrightnessSynchronizer.java
@@ -78,9 +78,9 @@
     // Feature flag that will eventually be removed
     private final boolean mIntRangeUserPerceptionEnabled;
 
-    public BrightnessSynchronizer(Context context, boolean intRangeUserPerceptionEnabled) {
-        this(context, Looper.getMainLooper(), SystemClock::uptimeMillis,
-                intRangeUserPerceptionEnabled);
+    public BrightnessSynchronizer(Context context, Looper looper,
+            boolean intRangeUserPerceptionEnabled) {
+        this(context, looper, SystemClock::uptimeMillis, intRangeUserPerceptionEnabled);
     }
 
     @VisibleForTesting
diff --git a/services/core/java/com/android/server/display/DisplayManagerService.java b/services/core/java/com/android/server/display/DisplayManagerService.java
index e686779..43c1f24f2 100644
--- a/services/core/java/com/android/server/display/DisplayManagerService.java
+++ b/services/core/java/com/android/server/display/DisplayManagerService.java
@@ -598,10 +598,11 @@
         FoldSettingProvider foldSettingProvider = new FoldSettingProvider(context,
                 new SettingsWrapper(),
                 new FoldLockSettingAvailabilityProvider(context.getResources()));
+        Looper displayThreadLooper = DisplayThread.get().getLooper();
         mInjector = injector;
         mContext = context;
         mFlags = injector.getFlags();
-        mHandler = new DisplayManagerHandler(DisplayThread.get().getLooper());
+        mHandler = new DisplayManagerHandler(displayThreadLooper);
         mUiHandler = UiThread.getHandler();
         mDisplayDeviceRepo = new DisplayDeviceRepository(mSyncRoot, mPersistentDataStore);
         mLogicalDisplayMapper = new LogicalDisplayMapper(mContext,
@@ -609,7 +610,7 @@
                 mDisplayDeviceRepo, new LogicalDisplayListener(), mSyncRoot, mHandler, mFlags);
         mDisplayModeDirector = new DisplayModeDirector(
                 context, mHandler, mFlags, mDisplayDeviceConfigProvider);
-        mBrightnessSynchronizer = new BrightnessSynchronizer(mContext,
+        mBrightnessSynchronizer = new BrightnessSynchronizer(mContext, displayThreadLooper,
                 mFlags.isBrightnessIntRangeUserPerceptionEnabled());
         Resources resources = mContext.getResources();
         mDefaultDisplayDefaultColorMode = mContext.getResources().getInteger(