scheduler: Move WebFrameScheduler and WebScheduler into Blink

third_party/WebKit/public/platform/WebViewScheduler.h

-// 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 WebViewScheduler_h
-#define WebViewScheduler_h
-
-#include "WebCommon.h"
-#include "public/platform/BlameContext.h"
-
-#include <memory>
-
-namespace blink {
-
-class WebFrameScheduler;
-
-class BLINK_PLATFORM_EXPORT WebViewScheduler {
- public:
-  // Helper interface to plumb settings from WebSettings to scheduler.
-  class BLINK_PLATFORM_EXPORT WebViewSchedulerSettings {
-   public:
-    virtual ~WebViewSchedulerSettings() {}
-
-    // Background throttling aggressiveness settings.
-    virtual float ExpensiveBackgroundThrottlingCPUBudget() = 0;
-    virtual float ExpensiveBackgroundThrottlingInitialBudget() = 0;
-    virtual float ExpensiveBackgroundThrottlingMaxBudget() = 0;
-    virtual float ExpensiveBackgroundThrottlingMaxDelay() = 0;
-  };
-
-  virtual ~WebViewScheduler() {}
-
-  // The scheduler may throttle tasks associated with background pages.
-  virtual void SetPageVisible(bool) = 0;
-
-  // Creates a new WebFrameScheduler. The caller is responsible for deleting
-  // it. All tasks executed by the frame scheduler will be attributed to
-  // |BlameContext|.
-  virtual std::unique_ptr<WebFrameScheduler> CreateFrameScheduler(
-      BlameContext*) = 0;
-
-  // Instructs this WebViewScheduler to use virtual time. When virtual time is
-  // enabled the system doesn't actually sleep for the delays between tasks
-  // before executing them. E.g: A-E are delayed tasks
-  //
-  // |    A   B C  D           E  (normal)
-  // |-----------------------------> time
-  //
-  // |ABCDE                       (virtual time)
-  // |-----------------------------> time
-  virtual void EnableVirtualTime() = 0;
-
-  // Disables virtual time. Note that this is only used for testing, because
-  // there's no reason to do this in production.
-  virtual void DisableVirtualTimeForTesting() = 0;
-
-  // Returns true if virtual time is currently allowed to advance.
-  virtual bool VirtualTimeAllowedToAdvance() const = 0;
-
-  enum class VirtualTimePolicy {
-    // In this policy virtual time is allowed to advance. If the blink scheduler
-    // runs out of immediate work, the virtual timebase will be incremented so
-    // that the next sceduled timer may fire.  NOTE Tasks will be run in time
-    // order (as usual).
-    ADVANCE,
-
-    // In this policy virtual time is not allowed to advance. Delayed tasks
-    // posted to WebTaskRunners owned by any child WebFrameSchedulers will be
-    // paused, unless their scheduled run time is less than or equal to the
-    // current virtual time.  Note non-delayed tasks will run as normal.
-    PAUSE,
-
-    // In this policy virtual time is allowed to advance unless there are
-    // pending network fetches associated any child WebFrameScheduler, or a
-    // document is being parsed on a background thread. Initially virtual time
-    // is not allowed to advance until we have seen at least one load. The aim
-    // being to try and make loading (more) deterministic.
-    DETERMINISTIC_LOADING
-  };
-
-  // Sets the virtual time policy, which is applied imemdiatly to all child
-  // WebFrameSchedulers.
-  virtual void SetVirtualTimePolicy(VirtualTimePolicy) = 0;
-
-  virtual void AudioStateChanged(bool is_audio_playing) = 0;
-
-  virtual bool HasActiveConnectionForTest() const = 0;
-};
-
-}  // namespace blink
-
-#endif  // WebViewScheduler