Move VTTRegion Timers to TaskRunnerTimer

third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp

Index: third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp
diff --git a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp
index bf9b0addd00e247e7956e12fe32ff423a8cddc72..68ba34cff50109b896eead4d1030655559bd2124 100644
--- a/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp
+++ b/third_party/WebKit/Source/core/html/track/vtt/VTTRegion.cpp
@@ -39,6 +39,7 @@
 #include "core/html/HTMLDivElement.h"
 #include "core/html/track/vtt/VTTParser.h"
 #include "core/html/track/vtt/VTTScanner.h"
+#include "public/platform/Platform.h"
 #include "wtf/MathExtras.h"
 
 #define VTT_LOG_LEVEL 3
@@ -90,7 +91,9 @@ VTTRegion::VTTRegion()
       m_viewportAnchor(FloatPoint(defaultAnchorPointX, defaultAnchorPointY)),
       m_scroll(defaultScroll),
       m_currentTop(0),
-      m_scrollTimer(this, &VTTRegion::scrollTimerFired) {}
+      m_scrollTimer(Platform::current()->currentThread()->getWebTaskRunner(),
+                    this,
+                    &VTTRegion::scrollTimerFired) {}
 
 VTTRegion::~VTTRegion() {}