Introduce ChildScheduler as common base interface for WorkerScheduler and RendererScheduler.

content/child/scheduler/worker_scheduler_impl.cc

 // Copyright 2014 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 "content/child/scheduler/worker_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 34 matching lines @@
 WorkerSchedulerImpl::IdleTaskRunner() {
   DCHECK(initialized_);
   return helper_.IdleTaskRunner();
 }
 
 bool WorkerSchedulerImpl::CanExceedIdleDeadlineIfRequired() const {
   DCHECK(initialized_);
   return helper_.CanExceedIdleDeadlineIfRequired();
 }
 
+bool WorkerSchedulerImpl::ShouldYieldForHighPriorityWork() {
+  // We don't consider any work as being high priority on workers.
+  return false;
+}
+
 void WorkerSchedulerImpl::AddTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   DCHECK(initialized_);
   helper_.AddTaskObserver(task_observer);
 }
 
 void WorkerSchedulerImpl::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   DCHECK(initialized_);
   helper_.RemoveTaskObserver(task_observer);
@@ skipping 18 matching lines @@
   return true;
 }
 
 base::TimeTicks WorkerSchedulerImpl::CurrentIdleTaskDeadlineForTesting() const {
   base::TimeTicks deadline;
   helper_.CurrentIdleTaskDeadlineCallback(&deadline);
   return deadline;
 }
 
 }  // namespace content