print running task in both ok_log()

Change-Id: Ie69421ed36d596cb8c40f9858fac370ceba18c87
Reviewed-on: https://skia-review.googlesource.com/40022
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
diff --git a/tools/ok.cpp b/tools/ok.cpp
index edb60f1..ca99f33 100644
--- a/tools/ok.cpp
+++ b/tools/ok.cpp
@@ -91,7 +91,7 @@
     static void defer_logging() {}
 
     void ok_log(const char* msg) {
-        fprintf(stderr, "%s\n", msg);
+        fprintf(stderr, "[%s]\t%s\n", tls_currently_running, msg);
     }
 #endif