TaskScheduler: Add static_assert in TaskTraits::operator==.

base/task_scheduler/task_traits.cc

 // Copyright 2016 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/task_scheduler/task_traits.h"
 
+#include <stddef.h>
+
 #include <ostream>
 
 namespace base {
 
 // Do not rely on defaults hard-coded below beyond the guarantees described in
 // the header; anything else is subject to change. Tasks should explicitly
 // request defaults if the behavior is critical to the task.
 TaskTraits::TaskTraits()
     : with_file_io_(false),
       priority_(TaskPriority::BACKGROUND),
@@ skipping 11 matching lines @@
   return *this;
 }
 
 TaskTraits& TaskTraits::WithShutdownBehavior(
     TaskShutdownBehavior shutdown_behavior) {
   shutdown_behavior_ = shutdown_behavior;
   return *this;
 }
 
 bool TaskTraits::operator==(const TaskTraits& other) const {
+  static_assert(sizeof(TaskTraits) ==
+                    offsetof(TaskTraits, shutdown_behavior_) +
+                        sizeof(TaskTraits::shutdown_behavior_),
+                "TaskTraits members changed. Update operator==.");
   return with_file_io_ == other.with_file_io_ && priority_ == other.priority_ &&
          shutdown_behavior_ == other.shutdown_behavior_;
 }
 
 std::ostream& operator<<(std::ostream& os, const TaskPriority& task_priority) {
   switch (task_priority) {
     case TaskPriority::BACKGROUND:
       os << "BACKGROUND";
       break;
     case TaskPriority::USER_VISIBLE:
@@ skipping 16 matching lines @@
       os << "SKIP_ON_SHUTDOWN";
       break;
     case TaskShutdownBehavior::BLOCK_SHUTDOWN:
       os << "BLOCK_SHUTDOWN";
       break;
   }
   return os;
 }
 
 }  // namespace base