Add necessary support functions so that embedders can implemented pause on start and 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 "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 1051 matching lines @@
   MutexLocker ml(mutex_);
   // Check if we are in a valid state to make the isolate runnable.
   if (is_runnable() == true) {
     return false;  // Already runnable.
   }
   // Set the isolate as runnable and if we are being spawned schedule
   // isolate on thread pool for execution.
   ASSERT(object_store()->root_library() != Library::null());
   set_is_runnable(true);
   if (!ServiceIsolate::IsServiceIsolate(this)) {
-    message_handler()->set_pause_on_start(FLAG_pause_isolates_on_start);
-    message_handler()->set_pause_on_exit(FLAG_pause_isolates_on_exit);
     if (FLAG_pause_isolates_on_unhandled_exceptions) {
       debugger()->SetExceptionPauseInfo(kPauseOnUnhandledExceptions);
     }
   }
   IsolateSpawnState* state = spawn_state();
   if (state != NULL) {
     ASSERT(this == state->isolate());
     Run();
   }
   TimelineStream* stream = GetIsolateStream();
@@ skipping 727 matching lines @@
                      static_cast<int64_t>(origin_id()));
   int64_t start_time_millis = start_time() / kMicrosecondsPerMillisecond;
   jsobj.AddPropertyTimeMillis("startTime", start_time_millis);
   {
     JSONObject jsheap(&jsobj, "_heaps");
     heap()->PrintToJSONObject(Heap::kNew, &jsheap);
     heap()->PrintToJSONObject(Heap::kOld, &jsheap);
   }
 
   jsobj.AddProperty("livePorts", message_handler()->live_ports());
-  jsobj.AddProperty("pauseOnExit", message_handler()->pause_on_exit());
+  jsobj.AddProperty("pauseOnExit", message_handler()->should_pause_on_exit());
 
-  if (message_handler()->paused_on_start()) {
+  if (message_handler()->is_paused_on_start()) {
     ASSERT(debugger()->PauseEvent() == NULL);
     ServiceEvent pause_event(this, ServiceEvent::kPauseStart);
     jsobj.AddProperty("pauseEvent", &pause_event);
-  } else if (message_handler()->paused_on_exit()) {
+  } else if (message_handler()->is_paused_on_exit()) {
     ASSERT(debugger()->PauseEvent() == NULL);
     ServiceEvent pause_event(this, ServiceEvent::kPauseExit);
     jsobj.AddProperty("pauseEvent", &pause_event);
   } else if (debugger()->PauseEvent() != NULL && !resume_request_) {
     ServiceEvent pause_event(debugger()->PauseEvent());
     jsobj.AddProperty("pauseEvent", &pause_event);
   } else {
     ServiceEvent pause_event(this, ServiceEvent::kResume);
 
     // TODO(turnidge): Don't compute a full stack trace.
@@ skipping 794 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart