Send takeover msg from MT to CC using the animation path.

third_party/WebKit/Source/platform/animation/CompositorAnimationHost.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "platform/animation/CompositorAnimationHost.h"
 
 #include "cc/animation/scroll_offset_animations.h"
 
 namespace blink {
 
 CompositorAnimationHost::CompositorAnimationHost(cc::AnimationHost* host)
     : m_animationHost(host) {}
 
 bool CompositorAnimationHost::isNull() const
 {
     return !m_animationHost;
 }
 
-void CompositorAnimationHost::updateImplOnlyScrollOffsetAnimation(const gfx::Vector2dF& adjustment, cc::ElementId elementId)
+void CompositorAnimationHost::adjustImplOnlyScrollOffsetAnimation(cc::ElementId elementId, const gfx::Vector2dF& adjustment)
 {
     if (!m_animationHost)
         return;
 
-    cc::ScrollOffsetAnimationUpdate update(cc::ScrollOffsetAnimationUpdate::Type::SCROLL_OFFSET_CHANGED, elementId);
-    update.adjustment_ = adjustment;
-    m_animationHost->scroll_offset_animations().AddUpdate(update);
+    m_animationHost->scroll_offset_animations().AddAdjustmentUpdate(elementId, adjustment);
+}
+
+void CompositorAnimationHost::takeOverImplOnlyScrollOffsetAnimation(cc::ElementId elementId)
+{
+    if (!m_animationHost)
+        return;
+
+    m_animationHost->scroll_offset_animations().AddTakeoverUpdate(elementId);
 }
 
 } // namespace blink