Clean up kotlin warnings for lifecycle library.

Bug: 134925073
Test: ./gradlew assembleDebug
Change-Id: Ibdd5f010d9add1614e024269ca3d70a5a23a467a

diff --git a/buildSrc/src/main/kotlin/androidx/build/AndroidXPlugin.kt b/buildSrc/src/main/kotlin/androidx/build/AndroidXPlugin.kt
index e65b15b..af856e4 100644
--- a/buildSrc/src/main/kotlin/androidx/build/AndroidXPlugin.kt
+++ b/buildSrc/src/main/kotlin/androidx/build/AndroidXPlugin.kt

@@ -193,9 +193,7 @@
                     }
                 }
                 is KotlinBasePluginWrapper -> {
-                    if (project.name == "lifecycle-runtime-ktx" || // b/134925073
-                        project.name == "lifecycle-livedata-ktx" || // b/134925073
-                        project.name == "benchmark") { // b/134925431
+                    if (project.name == "benchmark") { // b/134925431
                         return@all
                     }
                     project.tasks.withType(KotlinCompile::class.java).configureEach { compile ->

diff --git a/lifecycle/lifecycle-livedata-ktx/build.gradle b/lifecycle/lifecycle-livedata-ktx/build.gradle
index 8cafa70..b289a13 100644
--- a/lifecycle/lifecycle-livedata-ktx/build.gradle
+++ b/lifecycle/lifecycle-livedata-ktx/build.gradle

@@ -33,6 +33,10 @@
     }
 }
 
+tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
+    kotlinOptions.freeCompilerArgs += ["-Xuse-experimental=kotlin.Experimental"]
+}
+
 dependencies {
     api(project(":lifecycle:lifecycle-livedata"))
     api(project(":lifecycle:lifecycle-livedata-core-ktx"))

diff --git a/lifecycle/lifecycle-runtime-ktx/src/androidTest/java/androidx/lifecycle/FakeLifecycleOwner.kt b/lifecycle/lifecycle-runtime-ktx/src/androidTest/java/androidx/lifecycle/FakeLifecycleOwner.kt
index a817e38..136bcff 100644
--- a/lifecycle/lifecycle-runtime-ktx/src/androidTest/java/androidx/lifecycle/FakeLifecycleOwner.kt
+++ b/lifecycle/lifecycle-runtime-ktx/src/androidTest/java/androidx/lifecycle/FakeLifecycleOwner.kt

@@ -65,7 +65,7 @@
         }
     }
 
-    private suspend fun getObserverCount(count: Int): Int {
+    private suspend fun getObserverCount(): Int {
         return withContext(Dispatchers.Main) {
             registry.observerCount
         }

diff --git a/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/DispatchQueue.kt b/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/DispatchQueue.kt
index 4f71877..7ace839 100644
--- a/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/DispatchQueue.kt
+++ b/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/DispatchQueue.kt

@@ -20,6 +20,7 @@
 import androidx.annotation.AnyThread
 import androidx.annotation.MainThread
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import java.util.ArrayDeque
 import java.util.Queue
 import kotlin.coroutines.EmptyCoroutineContext
@@ -86,6 +87,7 @@
     private fun canRun() = finished || !paused
 
     @AnyThread
+    @ExperimentalCoroutinesApi
     @SuppressLint("WrongThread") // false negative, we are checking the thread
     fun runOrEnqueue(runnable: Runnable) {
         Dispatchers.Main.immediate.dispatch(EmptyCoroutineContext, Runnable {

diff --git a/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/PausingDispatcher.kt b/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/PausingDispatcher.kt
index d40e75d..ffc821c 100644
--- a/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/PausingDispatcher.kt
+++ b/lifecycle/lifecycle-runtime-ktx/src/main/java/androidx/lifecycle/PausingDispatcher.kt

@@ -19,6 +19,7 @@
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.Runnable
 import kotlinx.coroutines.withContext
@@ -178,6 +179,7 @@
     @JvmField
     internal val dispatchQueue = DispatchQueue()
 
+    @ExperimentalCoroutinesApi
     override fun dispatch(context: CoroutineContext, block: Runnable) {
         dispatchQueue.runOrEnqueue(block)
     }