avoid 'may be used uninitialized' warnings in work_queue.cc

components/scheduler/base/work_queue.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 "components/scheduler/base/work_queue.h"
 
 #include "components/scheduler/base/work_queue_sets.h"
 
 namespace scheduler {
 namespace internal {
@@ skipping 73 matching lines @@
   work_queue_sets_ = work_queue_sets;
 }
 
 void WorkQueue::AssignSetIndex(size_t work_queue_set_index) {
   work_queue_set_index_ = work_queue_set_index;
 }
 
 bool WorkQueue::ShouldRunBefore(const WorkQueue* other_queue) const {
   DCHECK(!work_queue_.empty());
   DCHECK(!other_queue->work_queue_.empty());
-  EnqueueOrder enqueue_order;
-  EnqueueOrder other_enqueue_order;
+  EnqueueOrder enqueue_order = 0;
+  EnqueueOrder other_enqueue_order = 0;
   bool have_task = GetFrontTaskEnqueueOrder(&enqueue_order);
   bool have_other_task =
       other_queue->GetFrontTaskEnqueueOrder(&other_enqueue_order);
   DCHECK(have_task);
   DCHECK(have_other_task);
   return enqueue_order < other_enqueue_order;
 }
 
 }  // namespace internal
 }  // namespace scheduler