Don't idle tick isolates paused before start or exit

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 997 matching lines @@
 
 intptr_t Isolate::ProfileInterrupt() {
   if (profiler_data() == NULL) {
     // Profiler not setup for isolate.
     return 0;
   }
   if (profiler_data()->blocked()) {
     // 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.
     ProfileIdle();
     return 1;
   }
   ASSERT(state->id != Thread::kInvalidThreadId);
   ThreadInterrupter::InterruptThread(state);
   return 1;
 }
@@ skipping 178 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart