Disable trimMemory(BACKGROUND) on lock with a Flag

Issuing this trim level causes a massive leak on DMA heap where surfaces
get allocated on each unlock.

We need to fix underlying issue there before we can reenable the flag.

Bug:282816553
Bug:275486055

Test: atest ResourceTrimmerTest
Change-Id: I6eaa5f0aa1f56e2ff5c6345bef7d78b5a648a571

packages/SystemUI/src/com/android/systemui/flags/Flags.kt

@@ -665,6 +665,11 @@ object Flags {
     val WARN_ON_BLOCKING_BINDER_TRANSACTIONS =
         unreleasedFlag(2400, "warn_on_blocking_binder_transactions")
 
+    // TODO(b/283071711): Tracking bug
+    @JvmField
+    val TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK =
+            unreleasedFlag(2401, "trim_resources_with_background_trim_on_lock")
+
     // 2700 - unfold transitions
     // TODO(b/265764985): Tracking Bug
     @Keep

packages/SystemUI/src/com/android/systemui/keyguard/ResourceTrimmer.kt

@@ -24,6 +24,8 @@ import com.android.systemui.CoreStartable
 import com.android.systemui.dagger.SysUISingleton
 import com.android.systemui.dagger.qualifiers.Application
 import com.android.systemui.dagger.qualifiers.Background
+import com.android.systemui.flags.FeatureFlags
+import com.android.systemui.flags.Flags
 import com.android.systemui.keyguard.domain.interactor.KeyguardInteractor
 import com.android.systemui.keyguard.shared.model.WakefulnessState
 import com.android.systemui.utils.GlobalWindowManager
@@ -51,10 +53,15 @@ constructor(
     private val globalWindowManager: GlobalWindowManager,
     @Application private val applicationScope: CoroutineScope,
     @Background private val bgDispatcher: CoroutineDispatcher,
+    private val featureFlags: FeatureFlags,
 ) : CoreStartable, WakefulnessLifecycle.Observer {
 
     override fun start() {
         Log.d(LOG_TAG, "Resource trimmer registered.")
+        if (!featureFlags.isEnabled(Flags.TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK)) {
+            return
+        }
+
         applicationScope.launch(bgDispatcher) {
             // We need to wait for the AoD transition (and animation) to complete.
             // This means we're waiting for isDreaming (== implies isDoze) and dozeAmount == 1f
@@ -79,6 +86,10 @@ constructor(
         isDreaming: Boolean,
         isDozingFully: Boolean
     ) {
+        if (!featureFlags.isEnabled(Flags.TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK)) {
+            return
+        }
+
         if (DEBUG) {
             Log.d(
                 LOG_TAG,

packages/SystemUI/tests/src/com/android/systemui/keyguard/ResourceTrimmerTest.kt

@@ -4,7 +4,8 @@ import android.content.ComponentCallbacks2
 import android.testing.AndroidTestingRunner
 import androidx.test.filters.SmallTest
 import com.android.systemui.SysuiTestCase
-import com.android.systemui.flags.FeatureFlags
+import com.android.systemui.flags.FakeFeatureFlags
+import com.android.systemui.flags.Flags
 import com.android.systemui.keyguard.data.repository.FakeCommandQueue
 import com.android.systemui.keyguard.data.repository.FakeKeyguardBouncerRepository
 import com.android.systemui.keyguard.data.repository.FakeKeyguardRepository
@@ -35,14 +36,16 @@ class ResourceTrimmerTest : SysuiTestCase() {
     private val testDispatcher = UnconfinedTestDispatcher()
     private val testScope = TestScope(testDispatcher)
     private val keyguardRepository = FakeKeyguardRepository()
+    private val featureFlags = FakeFeatureFlags()
 
     @Mock private lateinit var globalWindowManager: GlobalWindowManager
-    @Mock private lateinit var featureFlags: FeatureFlags
     private lateinit var resourceTrimmer: ResourceTrimmer
 
     @Before
     fun setUp() {
         MockitoAnnotations.initMocks(this)
+        featureFlags.set(Flags.TRIM_RESOURCES_WITH_BACKGROUND_TRIM_AT_LOCK, true)
+        featureFlags.set(Flags.FACE_AUTH_REFACTOR, false)
         keyguardRepository.setWakefulnessModel(
             WakefulnessModel(WakefulnessState.AWAKE, WakeSleepReason.OTHER, WakeSleepReason.OTHER)
         )
@@ -60,7 +63,8 @@ class ResourceTrimmerTest : SysuiTestCase() {
                 interactor,
                 globalWindowManager,
                 testScope.backgroundScope,
-                testDispatcher
+                testDispatcher,
+                featureFlags
             )
         resourceTrimmer.start()
     }