Clean up EGL thread state at thread exit in nanobench and DM

bench/nanobench.cpp

Index: bench/nanobench.cpp
diff --git a/bench/nanobench.cpp b/bench/nanobench.cpp
index c7cc3f0239ba96256eb82edaa87605ba959a795a..3d24c678f296a4e0d6ae993ad28f0426eae0bfb8 100644
--- a/bench/nanobench.cpp
+++ b/bench/nanobench.cpp
@@ -1020,7 +1020,11 @@ int nanobench_main();
 int nanobench_main() {
     SetupCrashHandler();
     SkAutoGraphics ag;
+#if SK_SUPPORT_GPU
+    SkTaskGroup::Enabler enabled(FLAGS_threads, GrContextFactory::ReleaseGpuAPIsInThread);
+#else
     SkTaskGroup::Enabler enabled(FLAGS_threads);
+#endif
 
 #if SK_SUPPORT_GPU
     GrContextOptions grContextOpts;
@@ -1272,7 +1276,10 @@ int nanobench_main() {
     // SkEventTracer destructor
     gGrFactory.reset(nullptr);
 #endif
-
+#if SK_SUPPORT_GPU
+    // The main thread maybe ran GPU code.
+    GrContextFactory::ReleaseGpuAPIsInThread();
+#endif
     return 0;
 }