Allow calling GetFunctionName before unwinding.

Some extra initialization needs to occur before calling the local/remote
GetFunctioneName.

Also, cleanup the test code a bit:

- Make all local functions static.
- Create a common function to create and finish remote processes.
- Remove unused function.
- Fix the formatting a bit by making it match clang format.

Test: Ran the unit tests.
Change-Id: I998bed1378d582df59fdf9263df6f208db5d795a
diff --git a/libbacktrace/UnwindCurrent.h b/libbacktrace/UnwindCurrent.h
index 3023996..3656104 100644
--- a/libbacktrace/UnwindCurrent.h
+++ b/libbacktrace/UnwindCurrent.h
@@ -32,18 +32,20 @@
 #include <libunwind.h>
 
 class UnwindCurrent : public BacktraceCurrent {
-public:
+ public:
   UnwindCurrent(pid_t pid, pid_t tid, BacktraceMap* map) : BacktraceCurrent(pid, tid, map) {}
   virtual ~UnwindCurrent() {}
 
   std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override;
 
-private:
+ private:
   void GetUnwContextFromUcontext(const ucontext_t* ucontext);
 
   bool UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucontext) override;
 
   unw_context_t context_;
+
+  bool initialized_ = false;
 };
 
 #endif // _LIBBACKTRACE_UNWIND_CURRENT_H