Removed main-thread one dimensional scrolling paths.

third_party/WebKit/Source/platform/scroll/ScrollAnimator.h

 /*
  * Copyright (c) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 
 class ScrollAnimatorTest;
 class CompositorAnimationTimeline;
 
 class PLATFORM_EXPORT ScrollAnimator final : public ScrollAnimatorBase {
 public:
     explicit ScrollAnimator(ScrollableArea*, WTF::TimeFunction = WTF::monotonicallyIncreasingTime);
     ~ScrollAnimator() override;
 
     bool hasRunningAnimation() const override;
-    float computeDeltaToConsume(ScrollbarOrientation, float pixelDelta) const override;
+    FloatSize computeDeltaToConsume(const FloatSize& delta) const override;
 
-    ScrollResultOneDimensional userScroll(ScrollbarOrientation, ScrollGranularity, float delta) override;
+    ScrollResult userScroll(ScrollGranularity, const FloatSize& delta) override;
     void scrollToOffsetWithoutAnimation(const FloatPoint&) override;
     FloatPoint desiredTargetPosition() const override;
 
     // ScrollAnimatorCompositorCoordinator implementation.
     void tickAnimation(double monotonicTime) override;
     void cancelAnimation() override;
     void resetAnimationState() override;
     void updateCompositorAnimations() override;
     void notifyCompositorAnimationFinished(int groupId) override;
     void notifyCompositorAnimationAborted(int groupId) override;
@@ skipping 27 matching lines @@
     // because we are already at targetPos.
     bool willAnimateToOffset(const FloatPoint& targetPos);
 
     FloatPoint m_targetOffset;
     ScrollGranularity m_lastGranularity;
 };
 
 } // namespace blink
 
 #endif // ScrollAnimator_h