Move ScrollableArea timer to TaskRunnerTimer.

third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp b/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
index 37b726adca8d9dd9b9c493959bb78a3e8b5d6f0a..08c88645d8e095511f00f58c4e37968e6eb164f1 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayerTest.cpp
@@ -45,6 +45,8 @@
 #include "public/platform/WebCompositorSupport.h"
 #include "public/platform/WebLayer.h"
 #include "public/platform/WebLayerTreeView.h"
+#include "public/platform/WebScheduler.h"
+#include "public/platform/WebThread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "wtf/PtrUtil.h"
 #include <memory>
@@ -192,6 +194,10 @@ class FakeScrollableArea : public GarbageCollectedFinalized<FakeScrollableArea>,
     return flooredIntSize(m_scrollOffset);
   }
 
+  RefPtr<WebTaskRunner> getTimerTaskRunner() const final {
+    return Platform::current()->currentThread()->scheduler()->timerTaskRunner();
+  }
+
   DEFINE_INLINE_VIRTUAL_TRACE() { ScrollableArea::trace(visitor); }
 
  private: