[tracing] Fix MemoryDumpManager periodic scheduler and improve tests

base/trace_event/malloc_dump_provider.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/trace_event/malloc_dump_provider.h"
 
 #include <malloc.h>
 
 #include "base/trace_event/process_memory_dump.h"
 
@@ skipping 21 matching lines @@
                                       ProcessMemoryDump* pmd) {
   struct mallinfo info = mallinfo();
   DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
 
   // When the system allocator is implemented by tcmalloc, the total heap
   // size is given by |arena| and |hblkhd| is 0. In case of Android's jemalloc
   // |arena| is 0 and the outer pages size is reported by |hblkhd|. In case of
   // dlmalloc the total is given by |arena| + |hblkhd|.
   // For more details see link: http://goo.gl/fMR8lF.
   MemoryAllocatorDump* outer_dump = pmd->CreateAllocatorDump("malloc");
-  outer_dump->AddScalar("heap_virtual_size",
+  outer_dump->AddScalar("virtual_size",
                         MemoryAllocatorDump::kUnitsBytes,
                         info.arena + info.hblkhd);
 
   // Total allocated space is given by |uordblks|.
   MemoryAllocatorDump* inner_dump = pmd->CreateAllocatorDump(kAllocatedObjects);
   inner_dump->AddScalar(MemoryAllocatorDump::kNameSize,
                         MemoryAllocatorDump::kUnitsBytes, info.uordblks);
 
   return true;
 }
 
 }  // namespace trace_event
 }  // namespace base