Ensure that calls to EnableGrowthControl/DisableGrowthControl does not reset the last_usage_ value …

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/isolate.h"
@@ skipping 473 matching lines @@
 void Heap::UpdateGlobalMaxUsed() {
   ASSERT(isolate_ != NULL);
   // We are accessing the used in words count for both new and old space
   // without synchronizing. The value of this metric is approximate.
   isolate_->GetHeapGlobalUsedMaxMetric()->SetValue(
       (UsedInWords(Heap::kNew) * kWordSize) +
       (UsedInWords(Heap::kOld) * kWordSize));
 }
 
 
+void Heap::InitGrowthControl() {
+  old_space_.InitGrowthControl();
+}
+
+
 void Heap::SetGrowthControlState(bool state) {
   old_space_.SetGrowthControlState(state);
 }
 
 
 bool Heap::GrowthControlState() {
   return old_space_.GrowthControlState();
 }
 
 
@@ skipping 332 matching lines @@
   Dart::vm_isolate()->heap()->WriteProtect(false, include_code_pages_);
 }
 
 
 WritableVMIsolateScope::~WritableVMIsolateScope() {
   ASSERT(Dart::vm_isolate()->heap()->UsedInWords(Heap::kNew) == 0);
   Dart::vm_isolate()->heap()->WriteProtect(true, include_code_pages_);
 }
 
 }  // namespace dart