Convert PageKeyedDataSource to coroutines

Test: ./gradlew paging:paging-common:check
Change-Id: I93b52115c77680b8858f7f6f98fd771eb8de9a77

diff --git a/paging/common/api/current.txt b/paging/common/api/current.txt
index 6738de4..bc1c7c6 100644
--- a/paging/common/api/current.txt
+++ b/paging/common/api/current.txt

@@ -128,6 +128,10 @@
     field public final int requestedLoadSize;
   }
 
+  public final class PageKeyedDataSourceKt {
+    ctor public PageKeyedDataSourceKt();
+  }
+
   public abstract class PagedList<T> extends java.util.AbstractList<T> {
     method public void addWeakCallback(java.util.List<? extends T>? previousSnapshot, androidx.paging.PagedList.Callback callback);
     method public void addWeakLoadStateListener(kotlin.jvm.functions.Function3<? super androidx.paging.PagedList.LoadType,? super androidx.paging.PagedList.LoadState,? super java.lang.Throwable,kotlin.Unit> listener);