Marshal 64 bit byte counts as double to the profiler.

chrome/browser/task_profiler/task_profiler_data_serializer.cc

 // Copyright (c) 2012 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 "chrome/browser/task_profiler/task_profiler_data_serializer.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/files/file_path.h"
@@ skipping 50 matching lines @@
   dictionary->SetInteger("count", death_data.count);
   dictionary->SetInteger("run_ms", death_data.run_duration_sum);
   dictionary->SetInteger("run_ms_max", death_data.run_duration_max);
   dictionary->SetInteger("run_ms_sample", death_data.run_duration_sample);
   dictionary->SetInteger("queue_ms", death_data.queue_duration_sum);
   dictionary->SetInteger("queue_ms_max", death_data.queue_duration_max);
   dictionary->SetInteger("queue_ms_sample", death_data.queue_duration_sample);
 
   dictionary->SetInteger("alloc_ops", death_data.alloc_ops);
   dictionary->SetInteger("free_ops", death_data.free_ops);
-  dictionary->SetInteger("allocated_bytes", death_data.allocated_bytes);
-  dictionary->SetInteger("freed_bytes", death_data.freed_bytes);
-  dictionary->SetInteger("alloc_overhead_bytes",
-                         death_data.alloc_overhead_bytes);
+  // The byte counts are 64 bit integers, pass them through as doubles, as
+  // integer values truncate to 32 bits.
+  dictionary->SetDouble("allocated_bytes", death_data.allocated_bytes);
+  dictionary->SetDouble("freed_bytes", death_data.freed_bytes);
+  dictionary->SetDouble("alloc_overhead_bytes",
+                        death_data.alloc_overhead_bytes);
   dictionary->SetInteger("max_allocated_bytes", death_data.max_allocated_bytes);
 }
 
 // Re-serializes the |snapshot| into |dictionary|.
 void TaskSnapshotToValue(const TaskSnapshot& snapshot,
                          base::DictionaryValue* dictionary) {
   BirthOnThreadSnapshotToValue(snapshot.birth, "birth", dictionary);
 
   std::unique_ptr<base::DictionaryValue> death_data(new base::DictionaryValue);
   DeathDataSnapshotToValue(snapshot.death_data, death_data.get());
@@ skipping 54 matching lines @@
     tasks_list->Append(std::move(snapshot));
   }
   dictionary->Set("list", tasks_list.release());
 
   dictionary->SetInteger("process_id", process_id);
   dictionary->SetString("process_type", content::GetProcessTypeNameInEnglish(
                                             AsChromeProcessType(process_type)));
 }
 
 }  // namespace task_profiler