Composited Animations: Support --disable-threaded-animation in new animation system.

Source/platform/scroll/ProgrammaticScrollAnimator.cpp

 // Copyright 2014 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 "config.h"
 #include "platform/scroll/ProgrammaticScrollAnimator.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/IntPoint.h"
 #include "platform/graphics/GraphicsLayer.h"
@@ skipping 13 matching lines @@
 }
 
 ProgrammaticScrollAnimator::ProgrammaticScrollAnimator(ScrollableArea* scrollableArea)
     : m_compositorAnimationAttachedToLayerId(0)
     , m_scrollableArea(scrollableArea)
     , m_startTime(0.0)
     , m_runState(RunState::Idle)
     , m_compositorAnimationId(0)
     , m_compositorAnimationGroupId(0)
 {
-    if (RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled()) {
+    if (RuntimeEnabledFeatures::compositorAnimationTimelinesEnabled() && Platform::current()->isThreadedAnimationEnabled()) {
         ASSERT(Platform::current()->compositorSupport());
         m_compositorPlayer = adoptPtr(Platform::current()->compositorSupport()->createAnimationPlayer());
         ASSERT(m_compositorPlayer);
         m_compositorPlayer->setAnimationDelegate(this);
     }
 }
 
 ProgrammaticScrollAnimator::~ProgrammaticScrollAnimator()
 {
     if (m_compositorPlayer) {
@@ skipping 234 matching lines @@
 {
     notifyCompositorAnimationFinished(group);
 }
 
 WebCompositorAnimationPlayer* ProgrammaticScrollAnimator::compositorPlayer() const
 {
     return m_compositorPlayer.get();
 }
 
 } // namespace blink