Surfaced native heap memory allocation information to the Observatory

runtime/vm/malloc_hooks.cc

 // Copyright (c) 2017, 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/globals.h"
 
 #if defined(DART_USE_TCMALLOC) && !defined(PRODUCT)
 
 #include "vm/malloc_hooks.h"
 
@@ skipping 205 matching lines @@
 
 
 void MallocHooks::ResetStats() {
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   ASSERT(MallocHooksState::initialized());
 
   MallocHooksState::ResetStats();
 }
 
 
+bool MallocHooks::Initialized() {
+  return MallocHooksState::initialized();
+}
+
+
 intptr_t MallocHooks::allocation_count() {
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   return MallocHooksState::allocation_count();
 }
 
 
 intptr_t MallocHooks::heap_allocated_memory_in_bytes() {
   MutexLocker ml(MallocHooksState::malloc_hook_mutex());
   return MallocHooksState::heap_allocated_memory_in_bytes();
 }
@@ skipping 33 matching lines @@
     if (MallocHooksState::address_map()->Lookup(ptr, &size)) {
       MallocHooksState::DecrementHeapAllocatedMemoryInBytes(size);
       MallocHooksState::address_map()->Remove(ptr);
     }
   }
 }
 
 }  // namespace dart
 
 #endif  // defined(DART_USE_TCMALLOC) && !defined(PRODUCT)