Remove PausableTimer

It is no longer used. All other classes have mitigated to using
CancelableTasks and ContextLifecycleObservers directly.

BUG=907125

Change-Id: I9bfa406836e842b1dfc2b14a9144758e3edd55d1
Reviewed-on: https://chromium-review.googlesource.com/c/1407094Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622125}

third_party/blink/renderer/core/frame/BUILD.gn

@@ -119,8 +119,6 @@ blink_core_sources("frame") {
     "pausable_script_executor.h",
     "pausable_task.cc",
     "pausable_task.h",
-    "pausable_timer.cc",
-    "pausable_timer.h",
     "performance_monitor.cc",
     "performance_monitor.h",
     "picture_in_picture_controller.cc",

third_party/blink/renderer/core/frame/pausable_task.h

@@ -33,7 +33,7 @@ class CORE_EXPORT PausableTask final
   // callback when execution is unpaused.
   static void Post(ExecutionContext*, WebLocalFrame::PausableTaskCallback);
 
-  // PausableTimer:
+  // ContextLifecycleObserver:
   void ContextDestroyed(ExecutionContext*) override;
 
  private:

third_party/blink/renderer/core/frame/pausable_timer.cc

-/*
- * Copyright (C) 2008 Apple Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include "third_party/blink/renderer/core/frame/pausable_timer.h"
-
-#include "third_party/blink/public/platform/task_type.h"
-
-namespace blink {
-
-namespace {
-// TimerBase::NextFireIntervalDelta returns a delta >= 0.
-constexpr TimeDelta kNextFireIntervalInvalid = TimeDelta::Min();
-}  // namespace
-
-PausableTimer::PausableTimer(ExecutionContext* context, TaskType task_type)
-    : TimerBase(context->GetTaskRunner(task_type)),
-      PausableObject(context),
-      next_fire_interval_(kNextFireIntervalInvalid) {
-  DCHECK(context);
-}
-
-PausableTimer::~PausableTimer() = default;
-
-void PausableTimer::Stop() {
-  next_fire_interval_ = kNextFireIntervalInvalid;
-  TimerBase::Stop();
-}
-
-void PausableTimer::ContextDestroyed(ExecutionContext*) {
-  Stop();
-}
-
-void PausableTimer::Pause() {
-#if DCHECK_IS_ON()
-  DCHECK(!paused_);
-  paused_ = true;
-#endif
-  if (IsActive()) {
-    next_fire_interval_ = NextFireInterval();
-    DCHECK_GE(next_fire_interval_, TimeDelta());
-    repeat_interval_ = RepeatInterval();
-    TimerBase::Stop();
-  }
-}
-
-void PausableTimer::Unpause() {
-#if DCHECK_IS_ON()
-  DCHECK(paused_);
-  paused_ = false;
-#endif
-  if (next_fire_interval_ >= TimeDelta()) {
-    // start() was called before, therefore location() is already set.
-    // m_nextFireInterval is only set in suspend() if the Timer was active.
-    Start(next_fire_interval_, repeat_interval_, GetLocation());
-    next_fire_interval_ = kNextFireIntervalInvalid;
-  }
-}
-
-}  // namespace blink

third_party/blink/renderer/core/frame/pausable_timer.h

-/*
- * Copyright (C) 2008 Apple Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAUSABLE_TIMER_H_
-#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAUSABLE_TIMER_H_
-
-#include "third_party/blink/renderer/core/core_export.h"
-#include "third_party/blink/renderer/core/dom/pausable_object.h"
-#include "third_party/blink/renderer/platform/timer.h"
-
-namespace blink {
-
-class CORE_EXPORT PausableTimer : public TimerBase, public PausableObject {
- public:
-  explicit PausableTimer(ExecutionContext*, TaskType);
-  ~PausableTimer() override;
-
-  // PausableObject
-  void ContextDestroyed(ExecutionContext*) override;
-  void Pause() final;
-  void Unpause() final;
-
-  void Stop() override;
-
- private:
-  void Fired() override = 0;
-
-  TimeDelta next_fire_interval_;
-  TimeDelta repeat_interval_;
-#if DCHECK_IS_ON()
-  bool paused_ = false;
-#endif
-};
-
-}  // namespace blink
-
-#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_PAUSABLE_TIMER_H_