Add an API to V8 to get simple heap statistics.

test/cctest/test-api.cc

 // Copyright 2007-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 8135 matching lines @@
     env->Global()->Set(v8_str("get_stack_limit"), fun);
     CompileRun("get_stack_limit();");
 
     CHECK(stack_limit == set_limit);
   }
   {
     v8::Locker locker;
     CHECK(stack_limit == set_limit);
   }
 }
+
+
+THREADED_TEST(GetHeapStatistics) {
+  v8::HandleScope scope;
+  LocalContext c1;
+  v8::HeapStatistics heap_statistics;
+  CHECK_EQ(heap_statistics.total_heap_size(), 0);
+  CHECK_EQ(heap_statistics.used_heap_size(), 0);
+  v8::V8::GetHeapStatistics(&heap_statistics);
+  CHECK_NE(heap_statistics.total_heap_size(), 0);
+  CHECK_NE(heap_statistics.used_heap_size(), 0);
+}