Added an API for creating RuntimeEffects using the SkSL DSL.

Change-Id: I305016d305455e2b90fe904d8da93cf7735cc38e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/389316
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
diff --git a/src/sksl/SkSLPool.h b/src/sksl/SkSLPool.h
index 005310c..e464797 100644
--- a/src/sksl/SkSLPool.h
+++ b/src/sksl/SkSLPool.h
@@ -47,6 +47,8 @@
     // the pool can be destroyed.
     static void FreeMemory(void* ptr);
 
+    static bool IsAttached();
+
 private:
     void checkForLeaks();