Move ScrollableArea timer to TaskRunnerTimer.

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index f7aeadb1036ab9aedde8012605a4a8605de8b087..a57884d03b646f258f1f24b7a4a8efb86e5ea21c 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -48,6 +48,7 @@
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Node.h"
+#include "core/dom/TaskRunnerHelper.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameHost.h"
@@ -882,6 +883,10 @@ FloatQuad PaintLayerScrollableArea::localToVisibleContentQuad(
   return localObject->localToAncestorQuad(quad, box, flags);
 }
 
+RefPtr<WebTaskRunner> PaintLayerScrollableArea::getTimerTaskRunner() const {
+  return TaskRunnerHelper::get(TaskType::UnspecedTimer, box().frame());
+}
+
 ScrollBehavior PaintLayerScrollableArea::scrollBehaviorStyle() const {
   return box().style()->getScrollBehavior();
 }