content: Add RendererScheduler.

content/renderer/scheduler/web_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/renderer/scheduler/web_scheduler_impl.h"
+
+#include "base/bind.h"
+#include "content/renderer/scheduler/renderer_scheduler.h"
+#include "third_party/WebKit/public/platform/WebTraceLocation.h"
+
+namespace content {
+
+WebSchedulerImpl::WebSchedulerImpl(RendererScheduler* renderer_scheduler)
+    : renderer_scheduler_(renderer_scheduler),
+      idle_task_runner_(renderer_scheduler_->IdleTaskRunner()) {
+}
+
+WebSchedulerImpl::~WebSchedulerImpl() {
+}
+
+bool WebSchedulerImpl::shouldYieldForHighPriorityWork() {
+  return renderer_scheduler_->ShouldYieldForHighPriorityWork();
+}
+
+void WebSchedulerImpl::runIdleTask(blink::WebScheduler::IdleTask* task,
+                                   base::TimeTicks deadline) {
+  task->run((deadline - base::TimeTicks()).InSecondsF());
+}
+
+void WebSchedulerImpl::postIdleTask(const blink::WebTraceLocation& web_location,
+                                    blink::WebScheduler::IdleTask* task) {
+  tracked_objects::Location location(
+      web_location.functionName(), web_location.fileName(), -1, nullptr);
+  idle_task_runner_->PostIdleTask(
+      location, base::Bind(&WebSchedulerImpl::runIdleTask, base::Owned(task)));

[no sievers, 2014/10/30 23:40:51]

would it work to be paranoid and use base::Passed(task) here and receive a
scoped_ptr in runIdleTask so that really (as long as the task is run) nobody can
hold another ref to the bound state?

[rmcilroy, 2014/11/03 21:21:55]

Done (missed replying to this comment last time).

+}
+
+void WebSchedulerImpl::shutdown() {
+  return renderer_scheduler_->Shutdown();
+}
+
+}  // namespace content