More debugger support.

This gets us as far as the first DDMS-specific message, which means
it's time to bring in a bunch more code.

Change-Id: I3f9d75706d5ddde0aa21fcca558132282b94eff4
diff --git a/src/thread_list.h b/src/thread_list.h
index 3a20405..baa7dad 100644
--- a/src/thread_list.h
+++ b/src/thread_list.h
@@ -36,8 +36,9 @@
 
   // Thread suspension support.
   void FullSuspendCheck(Thread* thread);
-  void ResumeAll();
-  void SuspendAll();
+  void ResumeAll(bool for_debugger = false);
+  void SuspendAll(bool for_debugger = false);
+  void SuspendSelfForDebugger();
   void RunWhileSuspended(Thread* thread, void (*callback)(void*), void* arg);
 
   void Register();