Add comments for struct members that were changed from size_t to uin32_t or uint64_t for IPC safety.

chrome/browser/task_management/sampling/task_group.cc

Index: chrome/browser/task_management/sampling/task_group.cc
diff --git a/chrome/browser/task_management/sampling/task_group.cc b/chrome/browser/task_management/sampling/task_group.cc
index c8d9bf1e38348c6075cecd83e439c468b508771c..9911136d9cf37e55f6f44e50358605e1b95c6571 100644
--- a/chrome/browser/task_management/sampling/task_group.cc
+++ b/chrome/browser/task_management/sampling/task_group.cc
@@ -188,7 +188,7 @@ void TaskGroup::RefreshGpuMemory(
     return;
   }
 
-  gpu_memory_ = static_cast<int64_t>(itr->second.video_memory);
+  gpu_memory_ = itr->second.video_memory;
   gpu_memory_has_duplicates_ = itr->second.has_duplicates;
 }