Don't idle tick isolates paused before start or exit

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index 003c59d849655993ab0a7cff2f4069ba3d6d2f03..57679ab2fab9b3e1165ef6f337fe8ed31d07f336 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -1015,6 +1015,11 @@ intptr_t Isolate::ProfileInterrupt() {
     // Profiler blocked for this isolate.
     return 0;
   }
+  if (message_handler()->paused_on_exit() ||
+      message_handler()->paused_on_start()) {

[turnidge, 2014/05/28 20:51:14]

How do you feel about adding...

    debugger()->IsPaused()

...while you are at it.  It will stop ticks while we are at breakpoint, etc.

[Cutch, 2014/05/28 20:54:06]

Done.

+    // Paused before start / exit. Don't tick.
+    return 0;
+  }
   InterruptableThreadState* state = thread_state();
   if (state == NULL) {
     // Isolate is not scheduled on a thread.