cc: Disallow scroll offset animations when impl-scrolling isn't supported

cc/layers/layer.cc

 // Copyright 2010 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 "cc/layers/layer.h"
 
 #include <algorithm>
 
 #include "base/atomic_sequence_num.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
 #include "base/metrics/histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_events.h"
+#include "cc/animation/animation_registrar.h"
 #include "cc/animation/keyframed_animation_curve.h"
 #include "cc/animation/layer_animation_controller.h"
 #include "cc/layers/layer_client.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/layers/scrollbar_layer_interface.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/trees/layer_tree_host.h"
 #include "cc/trees/layer_tree_impl.h"
 #include "third_party/skia/include/core/SkImageFilter.h"
@@ skipping 1065 matching lines @@
 }
 
 bool Layer::IsActive() const {
   return true;
 }
 
 bool Layer::AddAnimation(scoped_ptr <Animation> animation) {
   if (!layer_animation_controller_->animation_registrar())
     return false;
 
+  if (animation->target_property() == Animation::ScrollOffset &&
+      !layer_animation_controller_->animation_registrar()
+           ->supports_scroll_animations())
+    return false;
+
   UMA_HISTOGRAM_BOOLEAN("Renderer.AnimationAddedToOrphanLayer",
                         !layer_tree_host_);
   layer_animation_controller_->AddAnimation(animation.Pass());
   SetNeedsCommit();
   return true;
 }
 
 void Layer::PauseAnimation(int animation_id, double time_offset) {
   layer_animation_controller_->PauseAnimation(
       animation_id, base::TimeDelta::FromSecondsD(time_offset));
@@ skipping 68 matching lines @@
   if (clip_parent_)
     clip_parent_->RemoveClipChild(this);
 
   clip_parent_ = NULL;
 }
 
 void Layer::RunMicroBenchmark(MicroBenchmark* benchmark) {
   benchmark->RunOnLayer(this);
 }
 }  // namespace cc