scheduler: Move WebFrameScheduler and WebScheduler into Blink

third_party/WebKit/public/platform/WebScheduler.h

-// 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.
-
-#ifndef WebScheduler_h
-#define WebScheduler_h
-
-#include "WebCommon.h"
-#include "WebString.h"
-#include "public/platform/WebThread.h"
-#include "public/platform/WebTraceLocation.h"
-#include "public/platform/WebViewScheduler.h"
-
-#include <memory>
-
-namespace blink {
-
-class WebTaskRunner;
-
-// This class is used to submit tasks and pass other information from Blink to
-// the platform's scheduler.
-// TODO(skyostil): Replace this class with RendererScheduler.
-class BLINK_PLATFORM_EXPORT WebScheduler {
- public:
-  class BLINK_PLATFORM_EXPORT InterventionReporter {
-   public:
-    virtual ~InterventionReporter() {}
-
-    // The scheduler has performed an intervention, described by |message|,
-    // which should be reported to the developer.
-    virtual void ReportIntervention(const WebString& message) = 0;
-  };
-
-  virtual ~WebScheduler() {}
-
-  // Called to prevent any more pending tasks from running. Must be called on
-  // the associated WebThread.
-  virtual void Shutdown() = 0;
-
-  // Returns true if there is high priority work pending on the associated
-  // WebThread and the caller should yield to let the scheduler service that
-  // work.  Must be called on the associated WebThread.
-  virtual bool ShouldYieldForHighPriorityWork() = 0;
-
-  // Returns true if a currently running idle task could exceed its deadline
-  // without impacting user experience too much. This should only be used if
-  // there is a task which cannot be pre-empted and is likely to take longer
-  // than the largest expected idle task deadline. It should NOT be polled to
-  // check whether more work can be performed on the current idle task after
-  // its deadline has expired - post a new idle task for the continuation of
-  // the work in this case.
-  // Must be called from the associated WebThread.
-  virtual bool CanExceedIdleDeadlineIfRequired() = 0;
-
-  // Schedule an idle task to run the associated WebThread. For non-critical
-  // tasks which may be reordered relative to other task types and may be
-  // starved for an arbitrarily long time if no idle time is available.
-  // Takes ownership of |IdleTask|. Can be called from any thread.
-  virtual void PostIdleTask(const WebTraceLocation&, WebThread::IdleTask*) = 0;
-
-  // Like postIdleTask but guarantees that the posted task will not run
-  // nested within an already-running task. Posting an idle task as
-  // non-nestable may not affect when the task gets run, or it could
-  // make it run later than it normally would, but it won't make it
-  // run earlier than it normally would.
-  virtual void PostNonNestableIdleTask(const WebTraceLocation&,
-                                       WebThread::IdleTask*) = 0;
-
-  // Returns a WebTaskRunner for loading tasks. Can be called from any thread.
-  virtual WebTaskRunner* LoadingTaskRunner() = 0;
-
-  // Returns a WebTaskRunner for timer tasks. Can be called from any thread.
-  virtual WebTaskRunner* TimerTaskRunner() = 0;
-
-  // Creates a new WebViewScheduler for a given WebView. Must be called from
-  // the associated WebThread.
-  virtual std::unique_ptr<WebViewScheduler> CreateWebViewScheduler(
-      InterventionReporter*,
-      WebViewScheduler::WebViewSchedulerSettings*) = 0;
-
-  // Suspends the timer queue and increments the timer queue suspension count.
-  // May only be called from the main thread.
-  virtual void SuspendTimerQueue() = 0;
-
-  // Decrements the timer queue suspension count and re-enables the timer queue
-  // if the suspension count is zero and the current scheduler policy allows it.
-  virtual void ResumeTimerQueue() = 0;
-
-  enum class NavigatingFrameType { kMainFrame, kChildFrame };
-
-  // Tells the scheduler that a navigation task is pending.
-  // TODO(alexclarke): Long term should this be a task trait?
-  virtual void AddPendingNavigation(NavigatingFrameType) = 0;
-
-  // Tells the scheduler that a navigation task is no longer pending.
-  virtual void RemovePendingNavigation(NavigatingFrameType) = 0;
-
-#ifdef INSIDE_BLINK
-  // Helpers for posting bound functions as tasks.
-  typedef Function<void(double deadline_seconds)> IdleTask;
-
-  void PostIdleTask(const WebTraceLocation&, std::unique_ptr<IdleTask>);
-  void PostNonNestableIdleTask(const WebTraceLocation&,
-                               std::unique_ptr<IdleTask>);
-#endif
-};
-
-}  // namespace blink
-
-#endif  // WebScheduler_h