Convert ItemKeyedDataSource to coroutines

Test: ./gradlew paging:paging-common:check
Change-Id: I9c2cfdc119c8927c9a591471a862265d7bb5517d

diff --git a/paging/common/api/current.txt b/paging/common/api/current.txt
index 6738de4..a372c63 100644
--- a/paging/common/api/current.txt
+++ b/paging/common/api/current.txt

@@ -59,8 +59,11 @@
     method public abstract Key getKey(Value item);
     method public final suspend Object load$lintWithKotlin(androidx.paging.DataSource.Params<Key> params, kotlin.coroutines.Continuation<? super androidx.paging.DataSource.BaseResult<Value>> p);
     method public abstract void loadAfter(androidx.paging.ItemKeyedDataSource.LoadParams<Key> params, androidx.paging.ItemKeyedDataSource.LoadCallback<Value> callback);
+    method @VisibleForTesting public final suspend Object loadAfter$lintWithKotlin(androidx.paging.ItemKeyedDataSource.LoadParams<Key> params, kotlin.coroutines.Continuation<? super androidx.paging.ItemKeyedDataSource.Result<Value>> p);
     method public abstract void loadBefore(androidx.paging.ItemKeyedDataSource.LoadParams<Key> params, androidx.paging.ItemKeyedDataSource.LoadCallback<Value> callback);
+    method @VisibleForTesting public final suspend Object loadBefore$lintWithKotlin(androidx.paging.ItemKeyedDataSource.LoadParams<Key> params, kotlin.coroutines.Continuation<? super androidx.paging.ItemKeyedDataSource.Result<Value>> p);
     method public abstract void loadInitial(androidx.paging.ItemKeyedDataSource.LoadInitialParams<Key> params, androidx.paging.ItemKeyedDataSource.LoadInitialCallback<Value> callback);
+    method @VisibleForTesting public final suspend Object loadInitial$lintWithKotlin(androidx.paging.ItemKeyedDataSource.LoadInitialParams<Key> params, kotlin.coroutines.Continuation<? super androidx.paging.ItemKeyedDataSource.InitialResult<Value>> p);
     method public final <ToValue> androidx.paging.ItemKeyedDataSource<Key,ToValue> map(androidx.arch.core.util.Function<Value,ToValue> function);
     method public final <ToValue> androidx.paging.ItemKeyedDataSource<Key,ToValue> map(kotlin.jvm.functions.Function1<? super Value,? extends ToValue> function);
     method public final <ToValue> androidx.paging.ItemKeyedDataSource<Key,ToValue> mapByPage(androidx.arch.core.util.Function<java.util.List<Value>,java.util.List<ToValue>> function);
@@ -91,6 +94,10 @@
     field public final int requestedLoadSize;
   }
 
+  public final class ItemKeyedDataSourceKt {
+    ctor public ItemKeyedDataSourceKt();
+  }
+
   public abstract class PageKeyedDataSource<Key, Value> extends androidx.paging.DataSource<Key,Value> {
     ctor public PageKeyedDataSource();
     method public final suspend Object load$lintWithKotlin(androidx.paging.DataSource.Params<Key> params, kotlin.coroutines.Continuation<? super androidx.paging.DataSource.BaseResult<Value>> p);