Implement Element.scrollIntoView for scroll-behavior: smooth.

third_party/WebKit/Source/platform/scroll/ProgrammaticScrollAnimator.cpp

 // 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 "platform/scroll/ProgrammaticScrollAnimator.h"
 
+#include <memory>
 #include "platform/animation/CompositorAnimation.h"
 #include "platform/animation/CompositorScrollOffsetAnimationCurve.h"
 #include "platform/geometry/IntSize.h"
 #include "platform/graphics/GraphicsLayer.h"
+#include "platform/scroll/ProgrammaticScrollCoordinator.h"
 #include "platform/scroll/ScrollableArea.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebCompositorSupport.h"
 #include "wtf/PtrUtil.h"
-#include <memory>
 
 namespace blink {
 
 ProgrammaticScrollAnimator::ProgrammaticScrollAnimator(
     ScrollableArea* scrollableArea)
     : m_scrollableArea(scrollableArea), m_startTime(0.0) {}
 
 ProgrammaticScrollAnimator::~ProgrammaticScrollAnimator() {}
 
 void ProgrammaticScrollAnimator::resetAnimationState() {
@@ skipping 43 matching lines @@
   if (!m_startTime)
     m_startTime = monotonicTime;
   double elapsedTime = monotonicTime - m_startTime;
   bool isFinished = (elapsedTime > m_animationCurve->duration());
   ScrollOffset offset =
       blinkOffsetFromCompositorOffset(m_animationCurve->getValue(elapsedTime));
   notifyOffsetChanged(offset);
 
   if (isFinished) {
     m_runState = RunState::PostAnimationCleanup;
+    getScrollableArea()
+        ->getProgrammaticScrollCoordinator()
+        ->notifyAnimationFinished();
   } else if (!m_scrollableArea->scheduleAnimation()) {
     notifyOffsetChanged(offset);
     resetAnimationState();
   }
 }
 
 void ProgrammaticScrollAnimator::updateCompositorAnimations() {
   if (m_runState == RunState::PostAnimationCleanup) {
     // No special cleanup, simply reset animation state. We have this state
     // here because the state machine is shared with ScrollAnimator which
@@ skipping 80 matching lines @@
   ASSERT(m_runState != RunState::RunningOnCompositorButNeedsUpdate);
   ScrollAnimatorCompositorCoordinator::compositorAnimationFinished(groupId);
 }
 
 DEFINE_TRACE(ProgrammaticScrollAnimator) {
   visitor->trace(m_scrollableArea);
   ScrollAnimatorCompositorCoordinator::trace(visitor);
 }
 
 }  // namespace blink