Second step towards loading the core library scripts directly from the sources

runtime/vm/heap.cc

 // Copyright (c) 2012, 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/heap.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/flags.h"
 #include "vm/heap_profiler.h"
@@ skipping 303 matching lines @@
   ASSERT(file_open != NULL);
   Dart_FileWriteCallback file_write = Isolate::file_write_callback();
   ASSERT(file_write != NULL);
   Dart_FileCloseCallback file_close = Isolate::file_close_callback();
   ASSERT(file_close != NULL);
   Isolate* isolate = Isolate::Current();
   const char* format = "%s-%s.hprof";
   intptr_t len = OS::SNPrint(NULL, 0, format, isolate->name(), reason);
   char* filename = isolate->current_zone()->Alloc<char>(len + 1);
   OS::SNPrint(filename, len + 1, format, isolate->name(), reason);
-  void* file = (*file_open)(filename);
+  void* file = (*file_open)(filename, true);
   if (file != NULL) {
     Profile(file_write, file);
     (*file_close)(file);
   }
 }
 
 
 const char* Heap::GCReasonToString(GCReason gc_reason) {
   switch (gc_reason) {
     case kNewSpace:
@@ skipping 152 matching lines @@
     heap->DisableGrowthControl();
 }
 
 
 NoHeapGrowthControlScope::~NoHeapGrowthControlScope() {
     Heap* heap = reinterpret_cast<Isolate*>(isolate())->heap();
     heap->SetGrowthControlState(current_growth_controller_state_);
 }
 
 }  // namespace dart