Include the crashing thread's name in crash dumps.

Change-Id: I7fd821e3f390fde3a7280689292373d413218893
diff --git a/src/utils.h b/src/utils.h
index e1c00ac..a31588b 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -267,6 +267,9 @@
 // Returns the calling thread's tid. (The C libraries don't expose this.)
 pid_t GetTid();
 
+// Returns the given thread's name.
+std::string GetThreadName(pid_t tid);
+
 // Returns details of the calling thread's stack.
 void GetThreadStack(void*& stack_base, size_t& stack_size);