Implement growth policy for old space using time and space signals.

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/compiler_stats.h"
 #include "vm/flags.h"
@@ skipping 158 matching lines @@
 
 
 void Heap::CollectAllGarbage() {
   new_space_->Scavenge(kInvokeApiCallbacks);
   old_space_->MarkSweep(kInvokeApiCallbacks);
   // TODO(iposva): Merge old and code space.
   // code_space_->MarkSweep(kInvokeApiCallbacks);
 }
 
 
+void Heap::EnableGrowthControl() {
+  old_space_->EnableGrowthControl();
+}
+
+
 uword Heap::TopAddress() {
   return reinterpret_cast<uword>(new_space_->TopAddress());
 }
 
 
 uword Heap::EndAddress() {
   return reinterpret_cast<uword>(new_space_->EndAddress());
 }
 
 
@@ skipping 29 matching lines @@
   isolate()->IncrementNoGCScopeDepth();
 }
 
 
 NoGCScope::~NoGCScope() {
   isolate()->DecrementNoGCScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart