Also dump a stack trace on a pthread assertion failure

runtime/vm/os_thread_android.cc

Index: runtime/vm/os_thread_android.cc
diff --git a/runtime/vm/os_thread_android.cc b/runtime/vm/os_thread_android.cc
index 0ea90e6cdb54ee09af4b238f18c7f1807b0bacf2..8f9c648ad25e8bbdfe2acb1562b250fdcc772dae 100644
--- a/runtime/vm/os_thread_android.cc
+++ b/runtime/vm/os_thread_android.cc
@@ -16,12 +16,15 @@
 #include "platform/signal_blocker.h"
 #include "platform/utils.h"
 
+#include "vm/profiler.h"
+
 namespace dart {
 
 #define VALIDATE_PTHREAD_RESULT(result) \
   if (result != 0) { \
     const int kBufferSize = 1024; \
     char error_message[kBufferSize]; \
+    NOT_IN_PRODUCT(Profiler::DumpStackTrace(true /* native_stack_trace */)); \
     Utils::StrError(result, error_message, kBufferSize); \
     FATAL2("pthread error: %d (%s)", result, error_message); \
   }