Add a WorkerScheduler and a WebThreadImplForWorker

content/child/scheduler/worker_scheduler_impl.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
+// 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.
 
-#ifndef CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
-#define CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#ifndef CONTENT_CHILD_SCHEDULER_WORKER_SCHEDULER_IMPL_H_
+#define CONTENT_CHILD_SCHEDULER_WORKER_SCHEDULER_IMPL_H_
 
-#include "content/renderer/scheduler/renderer_scheduler.h"
+#include "content/child/scheduler/worker_scheduler.h"
+#include "content/child/scheduler/scheduler_helper.h"
+
+namespace base {
+namespace trace_event {
+class ConvertableToTraceFormat;
+}
+}
 
 namespace content {
 
-class NullRendererScheduler : public RendererScheduler {
+class NestableSingleThreadTaskRunner;
+
+class CONTENT_EXPORT WorkerSchedulerImpl
+    : public WorkerScheduler,
+      public SchedulerHelper::SchedulerHelperDelegate {

[Sami, 2015/04/02 10:19:46]

I guess the delegate could be inherited privately?

[rmcilroy, 2015/04/02 11:01:26]

+1 (and for RendererSchedulerImpl too if possible)

[kinuko, 2015/04/02 13:03:08]

style-nit: private inheritance is not encouraged by our style guide (composition
is preferred if we want to hide the inheritance relationship)

[alex clarke (OOO till 29th), 2015/04/02 15:19:28]

In light of the style guide comments I think making this protected isn't worth
doing.

People would have to downcast the WorkerScheduler to get hold of this Impl
class, and I doubt that would be allowed via code-review.

  public:
-  NullRendererScheduler();
-  ~NullRendererScheduler() override;
+  WorkerSchedulerImpl(
+      scoped_refptr<NestableSingleThreadTaskRunner> main_task_runner);
+  ~WorkerSchedulerImpl() override;
 
+  // Implement WorkerScheduler:

[Sami, 2015/04/02 10:19:46]

nit: "WorkerScheduler implementation:" is the usual phrasing.

[alex clarke (OOO till 29th), 2015/04/02 15:19:28]

Done.

   scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() override;
-  scoped_refptr<base::SingleThreadTaskRunner> CompositorTaskRunner() override;
-  scoped_refptr<base::SingleThreadTaskRunner> LoadingTaskRunner() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
-
-  void WillBeginFrame(const cc::BeginFrameArgs& args) override;
-  void BeginFrameNotExpectedSoon() override;
-  void DidCommitFrameToCompositor() override;
-  void DidReceiveInputEventOnCompositorThread(
-      const blink::WebInputEvent& web_input_event) override;
-  void DidAnimateForInputOnCompositorThread() override;
-  bool IsHighPriorityWorkAnticipated() override;
-  bool ShouldYieldForHighPriorityWork() override;
   bool CanExceedIdleDeadlineIfRequired() const override;
   void AddTaskObserver(base::MessageLoop::TaskObserver* task_observer) override;
   void RemoveTaskObserver(
       base::MessageLoop::TaskObserver* task_observer) override;
+  void Init() override;
   void Shutdown() override;
 
+  void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source);
+  void SetWorkBatchSizeForTesting(size_t work_batch_size);
+
  private:
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
+  // SchedulerHelperDelegate implementation:
+  bool CanEnterLongIdlePeriod(
+      base::TimeTicks now,
+      base::TimeDelta* next_long_idle_period_delay_out) override;
 
-  DISALLOW_COPY_AND_ASSIGN(NullRendererScheduler);
+  void MaybeStartLongIdlePeriod();
+
+  SchedulerHelper helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(WorkerSchedulerImpl);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#endif  // CONTENT_CHILD_SCHEDULER_WORKER_SCHEDULER_IMPL_H_