Communicate MT changes to impl-only scroll offset animations

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

Index: third_party/WebKit/Source/platform/animation/CompositorAnimationHost.cpp
diff --git a/third_party/WebKit/Source/platform/animation/CompositorAnimationHost.cpp b/third_party/WebKit/Source/platform/animation/CompositorAnimationHost.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..092c5b9148ddf489da9d1afa2ddc27d6082a5aa6
--- /dev/null
+++ b/third_party/WebKit/Source/platform/animation/CompositorAnimationHost.cpp
@@ -0,0 +1,27 @@
+// 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/animation_host.h"
+
+namespace blink {
+
+CompositorAnimationHost::CompositorAnimationHost(cc::AnimationHost* host)
+    : m_animationHost(host) {}
+
+CompositorAnimationHost::~CompositorAnimationHost() {}
+
+cc::AnimationHost* CompositorAnimationHost::animationHost() const
+{
+    return m_animationHost;
+}
+
+void CompositorAnimationHost::addImplOnlyScrollOffsetAnimationUpdate(cc::ScrollOffsetAnimationUpdate update)
+{
+    if (m_animationHost)
+        m_animationHost->AddScrollOffsetAnimationUpdate(update);
+}
+
+} // namespace blink