Added code to trace zone and handles creation/deletion under flags

vm/handles_test.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 "platform/assert.h"
 #include "vm/flags.h"
 #include "vm/handles.h"
 #include "vm/heap.h"
 #include "vm/object.h"
 #include "vm/unit_test.h"
 #include "vm/zone.h"
 
 namespace dart {
 
-DECLARE_DEBUG_FLAG(bool, trace_handles_count);
+DECLARE_DEBUG_FLAG(bool, trace_handles);
 
 
 // Unit test for Zone handle allocation.
 TEST_CASE(AllocateZoneHandle) {
 #if defined(DEBUG)
-  FLAG_trace_handles_count = true;
+  FLAG_trace_handles = true;
 #endif
   // The previously run stub code generation may have created zone handles.
   int initial_count = VMHandles::ZoneHandleCount();
   static const int kNumHandles = 65;
   // Create some zone handles.
   for (int i = 0; i < kNumHandles; i++) {
     const Smi& handle = Smi::ZoneHandle(Smi::New(i));
     EXPECT(handle.IsSmi());
     EXPECT_EQ(i, handle.Value());
   }
   EXPECT_EQ(kNumHandles + initial_count, VMHandles::ZoneHandleCount());
   // Create some more zone handles.
   for (int i = kNumHandles; i < (2 * kNumHandles); i++) {
     const Smi& handle = Smi::ZoneHandle(Smi::New(i));
     EXPECT(handle.IsSmi());
     EXPECT_EQ(i, handle.Value());
   }
   EXPECT_EQ((2 * kNumHandles) + initial_count, VMHandles::ZoneHandleCount());
 }
 
 
 // Unit test for Scope handle allocation.
 TEST_CASE(AllocateScopeHandle) {
 #if defined(DEBUG)
-  FLAG_trace_handles_count = true;
+  FLAG_trace_handles = true;
 #endif
   int32_t handle_count = VMHandles::ScopedHandleCount();
   static const int kNumHandles = 65;
   // Create some scoped handles.
   {
     Isolate* isolate = Isolate::Current();
     HANDLESCOPE(isolate);
     for (int i = 0; i < kNumHandles; i++) {
       const Smi& handle = Smi::Handle(Smi::New(i));
       EXPECT(handle.IsSmi());
@@ skipping 17 matching lines @@
       EXPECT(handle.IsSmi());
       EXPECT_EQ(i, handle.Value());
     }
     EXPECT_EQ((handle_count + (2 * kNumHandles)),
               VMHandles::ScopedHandleCount());
   }
   EXPECT_EQ(handle_count, VMHandles::ScopedHandleCount());
 }
 
 }  // namespace dart