Move trace utils to tracinglib

Create new library, tracinglib, for storing common tracing utils,
including support for tracing of Kotlin coroutines.

Also, update package name of tracinglib from
com.android.systemui.tracing to com.android.app.tracing.

Flag: NONE
Test: Build and flash device, behavior is same before and after
Bug: 289353932
Change-Id: I08cc8a07fe1790e68149983ab877079300255a0b
diff --git a/packages/SystemUI/shared/Android.bp b/packages/SystemUI/shared/Android.bp
index 9c368eb..5b59e7d 100644
--- a/packages/SystemUI/shared/Android.bp
+++ b/packages/SystemUI/shared/Android.bp
@@ -53,6 +53,7 @@
         "SystemUIPluginLib",
         "SystemUIUnfoldLib",
         "SystemUISharedLib-Keyguard",
+        "tracinglib",
         "androidx.dynamicanimation_dynamicanimation",
         "androidx.concurrent_concurrent-futures",
         "androidx.lifecycle_lifecycle-runtime-ktx",
diff --git a/packages/SystemUI/shared/src/com/android/systemui/shared/animation/DisableSubpixelTextTransitionListener.kt b/packages/SystemUI/shared/src/com/android/systemui/shared/animation/DisableSubpixelTextTransitionListener.kt
index 7719246..637ce5f 100644
--- a/packages/SystemUI/shared/src/com/android/systemui/shared/animation/DisableSubpixelTextTransitionListener.kt
+++ b/packages/SystemUI/shared/src/com/android/systemui/shared/animation/DisableSubpixelTextTransitionListener.kt
@@ -19,7 +19,7 @@
 import android.view.ViewGroup
 import android.widget.TextView
 import androidx.core.view.forEach
-import com.android.systemui.tracing.traceSection
+import com.android.app.tracing.traceSection
 import com.android.systemui.unfold.UnfoldTransitionProgressProvider.TransitionProgressListener
 import java.lang.ref.WeakReference
 
diff --git a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceContextElement.kt b/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceContextElement.kt
deleted file mode 100644
index 7d1b65a..0000000
--- a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceContextElement.kt
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * Copyright (C) 2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.systemui.tracing
-
-import com.android.systemui.tracing.TraceUtils.Companion.instant
-import com.android.systemui.tracing.TraceUtils.Companion.traceCoroutine
-import kotlin.coroutines.CoroutineContext
-import kotlinx.coroutines.CopyableThreadContextElement
-import kotlinx.coroutines.CoroutineDispatcher
-import kotlinx.coroutines.DelicateCoroutinesApi
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-
-/**
- * Used for safely persisting [TraceData] state when coroutines are suspended and resumed.
- *
- * This is internal machinery for [traceCoroutine]. It cannot be made `internal` or `private`
- * because [traceCoroutine] is a Public-API inline function.
- *
- * @see traceCoroutine
- */
-@OptIn(DelicateCoroutinesApi::class)
-@ExperimentalCoroutinesApi
-class TraceContextElement(private val traceData: TraceData = TraceData()) :
-    CopyableThreadContextElement<TraceData?> {
-
-    companion object Key : CoroutineContext.Key<TraceContextElement>
-
-    override val key: CoroutineContext.Key<TraceContextElement> = Key
-
-    @OptIn(ExperimentalStdlibApi::class)
-    override fun updateThreadContext(context: CoroutineContext): TraceData? {
-        val oldState = threadLocalTrace.get()
-        oldState?.endAllOnThread()
-        threadLocalTrace.set(traceData)
-        instant("resuming ${context[CoroutineDispatcher]}")
-        traceData.beginAllOnThread()
-        return oldState
-    }
-
-    @OptIn(ExperimentalStdlibApi::class)
-    override fun restoreThreadContext(context: CoroutineContext, oldState: TraceData?) {
-        instant("suspending ${context[CoroutineDispatcher]}")
-        traceData.endAllOnThread()
-        threadLocalTrace.set(oldState)
-        oldState?.beginAllOnThread()
-    }
-
-    override fun copyForChild(): CopyableThreadContextElement<TraceData?> {
-        return TraceContextElement(traceData.copy())
-    }
-
-    override fun mergeForChild(overwritingElement: CoroutineContext.Element): CoroutineContext {
-        return TraceContextElement(traceData.copy())
-    }
-}
diff --git a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceData.kt b/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceData.kt
deleted file mode 100644
index b68d38c..0000000
--- a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceData.kt
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
- * Copyright (C) 2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.systemui.tracing
-
-import android.os.Build
-import android.util.Log
-import com.android.systemui.tracing.TraceUtils.Companion.beginSlice
-import com.android.systemui.tracing.TraceUtils.Companion.endSlice
-import com.android.systemui.tracing.TraceUtils.Companion.traceCoroutine
-import kotlin.random.Random
-
-/**
- * Used for giving each thread a unique [TraceData] for thread-local storage. `null` by default.
- * [threadLocalTrace] can only be used when it is paired with a [TraceContextElement].
- *
- * This ThreadLocal will be `null` if either 1) we aren't in a coroutine, or 2) the coroutine we are
- * in does not have a [TraceContextElement].
- *
- * This is internal machinery for [traceCoroutine]. It cannot be made `internal` or `private`
- * because [traceCoroutine] is a Public-API inline function.
- *
- * @see traceCoroutine
- */
-val threadLocalTrace = ThreadLocal<TraceData?>()
-
-/**
- * Used for storing trace sections so that they can be added and removed from the currently running
- * thread when the coroutine is suspended and resumed.
- *
- * This is internal machinery for [traceCoroutine]. It cannot be made `internal` or `private`
- * because [traceCoroutine] is a Public-API inline function.
- *
- * @see traceCoroutine
- */
-class TraceData {
-    private var slices = mutableListOf<TraceSection>()
-
-    /** Adds current trace slices back to the current thread. Called when coroutine is resumed. */
-    fun beginAllOnThread() {
-        slices.forEach { beginSlice(it.name) }
-    }
-
-    /**
-     * Removes all current trace slices from the current thread. Called when coroutine is suspended.
-     */
-    fun endAllOnThread() {
-        for (i in 0..slices.size) {
-            endSlice()
-        }
-    }
-
-    /**
-     * Creates a new trace section with a unique ID and adds it to the current trace data. The slice
-     * will also be added to the current thread immediately. This slice will not propagate to parent
-     * coroutines, or to child coroutines that have already started. The unique ID is used to verify
-     * that the [endSpan] is corresponds to a [beginSpan].
-     */
-    fun beginSpan(name: String): Int {
-        val newSlice = TraceSection(name, Random.nextInt(FIRST_VALID_SPAN, Int.MAX_VALUE))
-        slices.add(newSlice)
-        beginSlice(name)
-        return newSlice.id
-    }
-
-    /**
-     * Used by [TraceContextElement] when launching a child coroutine so that the child coroutine's
-     * state is isolated from the parent.
-     */
-    fun copy(): TraceData {
-        return TraceData().also { it.slices.addAll(slices) }
-    }
-
-    /**
-     * Ends the trace section and validates it corresponds with an earlier call to [beginSpan]. The
-     * trace slice will immediately be removed from the current thread. This information will not
-     * propagate to parent coroutines, or to child coroutines that have already started.
-     */
-    fun endSpan(id: Int) {
-        val v = slices.removeLast()
-        if (v.id != id) {
-            if (STRICT_MODE) {
-                throw IllegalArgumentException(errorMsg)
-            } else if (Log.isLoggable(TAG, Log.VERBOSE)) {
-                Log.v(TAG, errorMsg)
-            }
-        }
-        endSlice()
-    }
-
-    companion object {
-        private const val TAG = "TraceData"
-        const val INVALID_SPAN = -1
-        const val FIRST_VALID_SPAN = 1
-
-        /**
-         * If true, throw an exception instead of printing a warning when trace sections beginnings
-         * and ends are mismatched.
-         */
-        private val STRICT_MODE = Build.IS_ENG
-
-        private const val errorMsg =
-            "Mismatched trace section. This likely means you are accessing the trace local " +
-                "storage (threadLocalTrace) without a corresponding CopyableThreadContextElement." +
-                " This could happen if you are using a global dispatcher like Dispatchers.IO." +
-                " To fix this, use one of the coroutine contexts provided by the dagger scope " +
-                "(e.g. \"@Main CoroutineContext\")."
-    }
-}
diff --git a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceSection.kt b/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceSection.kt
deleted file mode 100644
index 469d9a2..0000000
--- a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceSection.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Copyright (C) 2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.systemui.tracing
-
-import com.android.systemui.tracing.TraceUtils.Companion.traceCoroutine
-
-/**
- * Represents a section of code executing in a coroutine. This can be split up into multiple slices
- * on different threads as the coroutine is suspended and resumed.
- *
- * This is internal machinery for [traceCoroutine]. It cannot be made `internal` or `private`
- * because [traceCoroutine] is a Public-API inline function.
- *
- * @param name the name of the slice to appear on the current thread's track.
- * @param id used for matching the beginning and end of trace sections and validating correctness
- * @see traceCoroutine
- */
-data class TraceSection(
-    val name: String,
-    val id: Int,
-)
diff --git a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceStateLogger.kt b/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceStateLogger.kt
deleted file mode 100644
index 3e235f5..0000000
--- a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceStateLogger.kt
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
- * Copyright (C) 2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.systemui.tracing
-
-import android.os.Trace
-
-/**
- * Utility class used to log state changes easily in a track with a custom name.
- *
- * Example of usage:
- * ```kotlin
- * class MyClass {
- *    val screenStateLogger = TraceStateLogger("Screen state")
- *
- *    fun onTurnedOn() { screenStateLogger.log("on") }
- *    fun onTurnedOff() { screenStateLogger.log("off") }
- * }
- * ```
- *
- * This creates a new slice in a perfetto trace only if the state is different than the previous
- * one.
- */
-class TraceStateLogger(
-    private val trackName: String,
-    private val logOnlyIfDifferent: Boolean = true,
-    private val instantEvent: Boolean = true
-) {
-
-    private var previousValue: String? = null
-
-    /** If needed, logs the value to a track with name [trackName]. */
-    fun log(newValue: String) {
-        if (instantEvent) {
-            Trace.instantForTrack(Trace.TRACE_TAG_APP, trackName, newValue)
-        }
-        if (logOnlyIfDifferent && previousValue == newValue) return
-        Trace.asyncTraceForTrackEnd(Trace.TRACE_TAG_APP, trackName, 0)
-        Trace.asyncTraceForTrackBegin(Trace.TRACE_TAG_APP, trackName, newValue, 0)
-        previousValue = newValue
-    }
-}
diff --git a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceUtils.kt b/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceUtils.kt
deleted file mode 100644
index 12a20ae..0000000
--- a/packages/SystemUI/shared/src/com/android/systemui/tracing/TraceUtils.kt
+++ /dev/null
@@ -1,418 +0,0 @@
-/*
- * Copyright (C) 2023 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.android.systemui.tracing
-
-import android.os.Trace
-import android.os.TraceNameSupplier
-import android.util.Log
-import com.android.systemui.tracing.TraceData.Companion.FIRST_VALID_SPAN
-import com.android.systemui.tracing.TraceData.Companion.INVALID_SPAN
-import java.util.concurrent.atomic.AtomicInteger
-import kotlin.coroutines.CoroutineContext
-import kotlin.coroutines.EmptyCoroutineContext
-import kotlin.coroutines.coroutineContext
-import kotlin.random.Random
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Deferred
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.async
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
-import kotlinx.coroutines.withContext
-
-/**
- * Run a block within a [Trace] section. Calls [Trace.beginSection] before and [Trace.endSection]
- * after the passed block.
- */
-inline fun <T> traceSection(tag: String, block: () -> T): T =
-    if (Trace.isTagEnabled(Trace.TRACE_TAG_APP)) {
-        Trace.traceBegin(Trace.TRACE_TAG_APP, tag)
-        try {
-            block()
-        } finally {
-            Trace.traceEnd(Trace.TRACE_TAG_APP)
-        }
-    } else {
-        block()
-    }
-
-class TraceUtils {
-    companion object {
-        const val TAG = "TraceUtils"
-        private const val DEBUG_COROUTINE_TRACING = false
-        const val DEFAULT_TRACK_NAME = "AsyncTraces"
-
-        inline fun traceRunnable(tag: String, crossinline block: () -> Unit): Runnable {
-            return Runnable { traceSection(tag) { block() } }
-        }
-
-        /**
-         * Helper function for creating a Runnable object that implements TraceNameSupplier.
-         *
-         * This is useful for posting Runnables to Handlers with meaningful names.
-         */
-        inline fun namedRunnable(tag: String, crossinline block: () -> Unit): Runnable {
-            return object : Runnable, TraceNameSupplier {
-                override fun getTraceName(): String = tag
-                override fun run() = block()
-            }
-        }
-
-        /**
-         * Cookie used for async traces. Shouldn't be public, but to use it inside inline methods
-         * there is no other way around.
-         */
-        val lastCookie = AtomicInteger(0)
-
-        /**
-         * Creates an async slice in a track called "AsyncTraces".
-         *
-         * This can be used to trace coroutine code. Note that all usages of this method will appear
-         * under a single track.
-         */
-        inline fun <T> traceAsync(method: String, block: () -> T): T =
-            traceAsync(DEFAULT_TRACK_NAME, method, block)
-
-        /**
-         * Creates an async slice in a track with [trackName] while [block] runs.
-         *
-         * This can be used to trace coroutine code. [method] will be the name of the slice,
-         * [trackName] of the track. The track is one of the rows visible in a perfetto trace inside
-         * SystemUI process.
-         */
-        inline fun <T> traceAsync(trackName: String, method: String, block: () -> T): T {
-            val cookie = lastCookie.incrementAndGet()
-            Trace.asyncTraceForTrackBegin(Trace.TRACE_TAG_APP, trackName, method, cookie)
-            try {
-                return block()
-            } finally {
-                Trace.asyncTraceForTrackEnd(Trace.TRACE_TAG_APP, trackName, cookie)
-            }
-        }
-
-        /**
-         * Convenience function for calling [CoroutineScope.launch] with [traceCoroutine] enable
-         * tracing.
-         *
-         * @see traceCoroutine
-         */
-        inline fun CoroutineScope.launch(
-            crossinline spanName: () -> String,
-            context: CoroutineContext = EmptyCoroutineContext,
-            // TODO(b/306457056): DO NOT pass CoroutineStart; doing so will regress .odex size
-            crossinline block: suspend CoroutineScope.() -> Unit
-        ): Job = launch(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [CoroutineScope.launch] with [traceCoroutine] enable
-         * tracing.
-         *
-         * @see traceCoroutine
-         */
-        inline fun CoroutineScope.launch(
-            spanName: String,
-            context: CoroutineContext = EmptyCoroutineContext,
-            // TODO(b/306457056): DO NOT pass CoroutineStart; doing so will regress .odex size
-            crossinline block: suspend CoroutineScope.() -> Unit
-        ): Job = launch(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [CoroutineScope.async] with [traceCoroutine] enable
-         * tracing
-         *
-         * @see traceCoroutine
-         */
-        inline fun <T> CoroutineScope.async(
-            crossinline spanName: () -> String,
-            context: CoroutineContext = EmptyCoroutineContext,
-            // TODO(b/306457056): DO NOT pass CoroutineStart; doing so will regress .odex size
-            crossinline block: suspend CoroutineScope.() -> T
-        ): Deferred<T> = async(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [CoroutineScope.async] with [traceCoroutine] enable
-         * tracing.
-         *
-         * @see traceCoroutine
-         */
-        inline fun <T> CoroutineScope.async(
-            spanName: String,
-            context: CoroutineContext = EmptyCoroutineContext,
-            // TODO(b/306457056): DO NOT pass CoroutineStart; doing so will regress .odex size
-            crossinline block: suspend CoroutineScope.() -> T
-        ): Deferred<T> = async(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [runBlocking] with [traceCoroutine] to enable tracing.
-         *
-         * @see traceCoroutine
-         */
-        inline fun <T> runBlocking(
-            crossinline spanName: () -> String,
-            context: CoroutineContext,
-            crossinline block: suspend () -> T
-        ): T = runBlocking(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [runBlocking] with [traceCoroutine] to enable tracing.
-         *
-         * @see traceCoroutine
-         */
-        inline fun <T> runBlocking(
-            spanName: String,
-            context: CoroutineContext,
-            crossinline block: suspend CoroutineScope.() -> T
-        ): T = runBlocking(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [withContext] with [traceCoroutine] to enable tracing.
-         *
-         * @see traceCoroutine
-         */
-        suspend inline fun <T> withContext(
-            spanName: String,
-            context: CoroutineContext,
-            crossinline block: suspend CoroutineScope.() -> T
-        ): T = withContext(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * Convenience function for calling [withContext] with [traceCoroutine] to enable tracing.
-         *
-         * @see traceCoroutine
-         */
-        suspend inline fun <T> withContext(
-            crossinline spanName: () -> String,
-            context: CoroutineContext,
-            crossinline block: suspend CoroutineScope.() -> T
-        ): T = withContext(context) { traceCoroutine(spanName) { block() } }
-
-        /**
-         * A hacky way to propagate the value of the COROUTINE_TRACING flag for static usage in this
-         * file. It should only every be set to true during startup. Once true, it cannot be set to
-         * false again.
-         */
-        var coroutineTracingIsEnabled = false
-            set(v) {
-                if (v) field = true
-            }
-
-        /**
-         * Traces a section of work of a `suspend` [block]. The trace sections will appear on the
-         * thread that is currently executing the [block] of work. If the [block] is suspended, all
-         * trace sections added using this API will end until the [block] is resumed, which could
-         * happen either on this thread or on another thread. If a child coroutine is started, it
-         * will inherit the trace sections of its parent. The child will continue to print these
-         * trace sections whether or not the parent coroutine is still running them.
-         *
-         * The current [CoroutineContext] must have a [TraceContextElement] for this API to work.
-         * Otherwise, the trace sections will be dropped.
-         *
-         * For example, in the following trace, Thread #1 ran some work, suspended, then continued
-         * working on Thread #2. Meanwhile, Thread #2 created a new child coroutine which inherited
-         * its trace sections. Then, the original coroutine resumed on Thread #1 before ending.
-         * Meanwhile Thread #3 is still printing trace sections from its parent because they were
-         * copied when it was created. There is no way for the parent to communicate to the child
-         * that it marked these slices as completed. While this might seem counterintuitive, it
-         * allows us to pinpoint the origin of the child coroutine's work.
-         *
-         * ```
-         * Thread #1 | [==== Slice A ====]                        [==== Slice A ====]
-         *           |       [==== B ====]                        [=== B ===]
-         * --------------------------------------------------------------------------------------
-         * Thread #2 |                    [====== Slice A ======]
-         *           |                    [========= B =========]
-         *           |                        [===== C ======]
-         * --------------------------------------------------------------------------------------
-         * Thread #3 |                            [== Slice A ==]                [== Slice A ==]
-         *           |                            [===== B =====]                [===== B =====]
-         *           |                            [===== C =====]                [===== C =====]
-         *           |                                                               [=== D ===]
-         * ```
-         *
-         * @param name The name of the code section to appear in the trace
-         * @see endSlice
-         * @see traceCoroutine
-         */
-        @OptIn(ExperimentalCoroutinesApi::class)
-        suspend inline fun <T> traceCoroutine(
-            spanName: Lazy<String>,
-            crossinline block: suspend () -> T
-        ): T {
-            // For coroutine tracing to work, trace spans must be added and removed even when
-            // tracing is not active (i.e. when TRACE_TAG_APP is disabled). Otherwise, when the
-            // coroutine resumes when tracing is active, we won't know its name.
-            val tracer = getTraceData(spanName)
-            val coroutineSpanCookie = tracer?.beginSpan(spanName.value) ?: INVALID_SPAN
-
-            // For now, also trace to "AsyncTraces". This will allow us to verify the correctness
-            // of the COROUTINE_TRACING feature flag.
-            val asyncTraceCookie =
-                if (Trace.isTagEnabled(Trace.TRACE_TAG_APP))
-                    Random.nextInt(FIRST_VALID_SPAN, Int.MAX_VALUE)
-                else INVALID_SPAN
-            if (asyncTraceCookie != INVALID_SPAN) {
-                Trace.asyncTraceForTrackBegin(
-                    Trace.TRACE_TAG_APP,
-                    DEFAULT_TRACK_NAME,
-                    spanName.value,
-                    asyncTraceCookie
-                )
-            }
-            try {
-                return block()
-            } finally {
-                if (asyncTraceCookie != INVALID_SPAN) {
-                    Trace.asyncTraceForTrackEnd(
-                        Trace.TRACE_TAG_APP,
-                        DEFAULT_TRACK_NAME,
-                        asyncTraceCookie
-                    )
-                }
-                tracer?.endSpan(coroutineSpanCookie)
-            }
-        }
-
-        @OptIn(ExperimentalCoroutinesApi::class)
-        suspend fun getTraceData(spanName: Lazy<String>): TraceData? {
-            if (!coroutineTracingIsEnabled) {
-                logVerbose("Experimental flag COROUTINE_TRACING is off", spanName)
-            } else if (coroutineContext[TraceContextElement] == null) {
-                logVerbose("Current CoroutineContext is missing TraceContextElement", spanName)
-            } else {
-                return threadLocalTrace.get().also {
-                    if (it == null) logVerbose("ThreadLocal TraceData is null", spanName)
-                }
-            }
-            return null
-        }
-
-        private fun logVerbose(logMessage: String, spanName: Lazy<String>) {
-            if (DEBUG_COROUTINE_TRACING && Log.isLoggable(TAG, Log.VERBOSE)) {
-                Log.v(TAG, "$logMessage. Dropping trace section: \"${spanName.value}\"")
-            }
-        }
-
-        /** @see traceCoroutine */
-        suspend inline fun <T> traceCoroutine(
-            spanName: String,
-            crossinline block: suspend () -> T
-        ): T = traceCoroutine(lazyOf(spanName)) { block() }
-
-        /** @see traceCoroutine */
-        suspend inline fun <T> traceCoroutine(
-            crossinline spanName: () -> String,
-            crossinline block: suspend () -> T
-        ): T = traceCoroutine(lazy(LazyThreadSafetyMode.PUBLICATION) { spanName() }) { block() }
-
-        /**
-         * Writes a trace message to indicate that a given section of code has begun running __on
-         * the current thread__. This must be followed by a corresponding call to [endSlice] in a
-         * reasonably short amount of time __on the same thread__ (i.e. _before_ the thread becomes
-         * idle again and starts running other, unrelated work).
-         *
-         * Calls to [beginSlice] and [endSlice] may be nested, and they will render in Perfetto as
-         * follows:
-         * ```
-         * Thread #1 | [==========================]
-         *           |       [==============]
-         *           |           [====]
-         * ```
-         *
-         * This function is provided for convenience to wrap a call to [Trace.traceBegin], which is
-         * more verbose to call than [Trace.beginSection], but has the added benefit of not throwing
-         * an [IllegalArgumentException] if the provided string is longer than 127 characters. We
-         * use the term "slice" instead of "section" to be consistent with Perfetto.
-         *
-         * # Avoiding malformed traces
-         *
-         * Improper usage of this API will lead to malformed traces with long slices that sometimes
-         * never end. This will look like the following:
-         * ```
-         * Thread #1 | [===================================================================== ...
-         *           |       [==============]         [====================================== ...
-         *           |           [=======]              [======]       [===================== ...
-         *           |                                                       [=======]
-         * ```
-         *
-         * To avoid this, [beginSlice] and [endSlice] should never be called from `suspend` blocks
-         * (instead, use [traceCoroutine] for tracing suspending functions). While it would be
-         * technically okay to call from a suspending function if that function were to only wrap
-         * non-suspending blocks with [beginSlice] and [endSlice], doing so is risky because suspend
-         * calls could be mistakenly added to that block as the code is refactored.
-         *
-         * Additionally, it is _not_ okay to call [beginSlice] when registering a callback and match
-         * it with a call to [endSlice] inside that callback, even if the callback runs on the same
-         * thread. Doing so would cause malformed traces because the [beginSlice] wasn't closed
-         * before the thread became idle and started running unrelated work.
-         *
-         * @param sliceName The name of the code section to appear in the trace
-         * @see endSlice
-         * @see traceCoroutine
-         */
-        fun beginSlice(sliceName: String) {
-            Trace.traceBegin(Trace.TRACE_TAG_APP, sliceName)
-        }
-
-        /**
-         * Writes a trace message to indicate that a given section of code has ended. This call must
-         * be preceded by a corresponding call to [beginSlice]. See [beginSlice] for important
-         * information regarding usage.
-         *
-         * @see beginSlice
-         * @see traceCoroutine
-         */
-        fun endSlice() {
-            Trace.traceEnd(Trace.TRACE_TAG_APP)
-        }
-
-        /**
-         * Writes a trace message indicating that an instant event occurred on the current thread.
-         * Unlike slices, instant events have no duration and do not need to be matched with another
-         * call. Perfetto will display instant events using an arrow pointing to the timestamp they
-         * occurred:
-         * ```
-         * Thread #1 | [==============]               [======]
-         *           |     [====]                        ^
-         *           |        ^
-         * ```
-         *
-         * @param eventName The name of the event to appear in the trace.
-         */
-        fun instant(eventName: String) {
-            Trace.instant(Trace.TRACE_TAG_APP, eventName)
-        }
-
-        /**
-         * Writes a trace message indicating that an instant event occurred on the given track.
-         * Unlike slices, instant events have no duration and do not need to be matched with another
-         * call. Perfetto will display instant events using an arrow pointing to the timestamp they
-         * occurred:
-         * ```
-         * Async  | [==============]               [======]
-         *  Track |     [====]                        ^
-         *   Name |        ^
-         * ```
-         *
-         * @param trackName The track where the event should appear in the trace.
-         * @param eventName The name of the event to appear in the trace.
-         */
-        fun instantForTrack(trackName: String, eventName: String) {
-            Trace.instantForTrack(Trace.TRACE_TAG_APP, trackName, eventName)
-        }
-    }
-}