Pass Callback to TaskRunner by value and consume it on invocation (1)

base/trace_event/memory_dump_manager_unittest.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/memory_dump_manager.h"
 
 #include <stdint.h>
 
 #include <memory>
+#include <utility>
 #include <vector>
 
 #include "base/bind_helpers.h"
+#include "base/callback.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/sequenced_worker_pool_owner.h"
 #include "base/test/test_io_thread.h"
 #include "base/test/trace_event_analyzer.h"
 #include "base/threading/platform_thread.h"
@@ skipping 72 matching lines @@
                           const scoped_refptr<RefCountedString>& json,
                           bool has_more_events) {
   buffer->AddFragment(json->data());
   if (!has_more_events)
     quit_closure.Run();
 }
 
 // Posts |task| to |task_runner| and blocks until it is executed.
 void PostTaskAndWait(const tracked_objects::Location& from_here,
                      SequencedTaskRunner* task_runner,
-                     const base::Closure& task) {
+                     base::Closure task) {
   base::WaitableEvent event(WaitableEvent::ResetPolicy::MANUAL,
                             WaitableEvent::InitialState::NOT_SIGNALED);
-  task_runner->PostTask(from_here, task);
+  task_runner->PostTask(from_here, std::move(task));
   task_runner->PostTask(
       FROM_HERE, base::Bind(&WaitableEvent::Signal, base::Unretained(&event)));
   // The SequencedTaskRunner guarantees that |event| will only be signaled after
   // |task| is executed.
   event.Wait();
 }
 
 }  // namespace
 
 // Testing MemoryDumpManagerDelegate which, by default, short-circuits dump
@@ skipping 55 matching lines @@
  public:
   TestSequencedTaskRunner()
       : worker_pool_(2 /* max_threads */, "Test Task Runner"),
         enabled_(true),
         num_of_post_tasks_(0) {}
 
   void set_enabled(bool value) { enabled_ = value; }
   unsigned no_of_post_tasks() const { return num_of_post_tasks_; }
 
   bool PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
-                                  const Closure& task,
+                                  Closure task,
                                   TimeDelta delay) override {
     NOTREACHED();
     return false;
   }
 
   bool PostDelayedTask(const tracked_objects::Location& from_here,
-                       const Closure& task,
+                       Closure task,
                        TimeDelta delay) override {
     num_of_post_tasks_++;
     if (enabled_) {
       return worker_pool_.pool()->PostSequencedWorkerTask(token_, from_here,
-                                                          task);
+                                                          std::move(task));
     }
     return false;
   }
 
   bool RunsTasksOnCurrentThread() const override {
     return worker_pool_.pool()->RunsTasksOnCurrentThread();
   }
 
  private:
   ~TestSequencedTaskRunner() override {}
@@ skipping 1080 matching lines @@
   thread.Start();
   RegisterDumpProvider(&mdp1, thread.task_runner(), kDefaultOptions,
                        "BlacklistTestDumpProvider");
   // Unregistering on wrong thread should not crash.
   mdm_->UnregisterDumpProvider(&mdp1);
   thread.Stop();
 }
 
 }  // namespace trace_event
 }  // namespace base