Move ScrollableArea timer to TaskRunnerTimer.

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

Index: third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
index 1acb2fd4a84b43aabb54299d71378a1180ca7204..946efa8168c2d3da98539e340b96d34ce890ace2 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollAnimatorTest.cpp
@@ -31,6 +31,9 @@
 #include "platform/geometry/IntRect.h"
 #include "platform/scroll/ScrollAnimatorBase.h"
 #include "platform/scroll/ScrollableArea.h"
+#include "public/platform/Platform.h"
+#include "public/platform/WebScheduler.h"
+#include "public/platform/WebThread.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -108,6 +111,10 @@ class MockScrollableArea : public GarbageCollectedFinalized<MockScrollableArea>,
     ScrollableArea::setScrollOffset(offset, type, behavior);
   }
 
+  RefPtr<WebTaskRunner> getTimerTaskRunner() const final {
+    return Platform::current()->currentThread()->scheduler()->timerTaskRunner();
+  }
+
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->trace(animator);
     ScrollableArea::trace(visitor);