Added heap capacity and used space status methods, for use by status tools.

runtime/vm/heap.h

 // 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.
 
 #ifndef VM_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 137 matching lines @@
   // Verify that all pointers in the heap point to the heap.
   bool Verify() const;
 
   // Accessor function to get the HeapTrace used for tracing.  There
   // should only ever be one of these per isolate
   HeapTrace* trace() const { return heap_trace_; }
 
   // Print heap sizes.
   void PrintSizes() const;
 
+  // Return amount of memory used and capacity in a space.
+  intptr_t Used(Space space) const;
+  intptr_t Capacity(Space space) const;
+
   // Returns the [lowest, highest) addresses in the heap.
   void StartEndAddress(uword* start, uword* end) const;
 
   ObjectSet* CreateAllocatedObjectSet() const;
 
   // Generates a profile of the current and VM isolate heaps.
   void Profile(Dart_FileWriteCallback callback, void* stream) const;
   void ProfileToFile(const char* reason) const;
 
   static const char* GCReasonToString(GCReason gc_reason);
@@ skipping 98 matching lines @@
  public:
   NoGCScope() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(NoGCScope);
 };
 #endif  // defined(DEBUG)
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_