Fix bounds clamping during composited smooth scroll.

cc/layers/layer_impl.cc

 // Copyright 2012 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_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 763 matching lines @@
   }
 }
 
 void LayerImpl::OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) {
   // Only layers in the active tree should need to do anything here, since
   // layers in the pending tree will find out about these changes as a
   // result of the shared SyncedProperty.
   if (!IsActive())
     return;
 
-  SetCurrentScrollOffset(scroll_offset);
+  SetCurrentScrollOffset(ClampScrollOffsetToLimits(scroll_offset));
 
   layer_tree_impl_->DidAnimateScrollOffset();
 }
 
 void LayerImpl::OnTransformIsPotentiallyAnimatingChanged(bool is_animating) {
   UpdatePropertyTreeTransformIsAnimated(is_animating);
   was_ever_ready_since_last_transform_animation_ = false;
 }
 
 bool LayerImpl::IsActive() const {
@@ skipping 615 matching lines @@
            .layer_transforms_should_scale_layer_contents) {
     return default_scale;
   }
 
   gfx::Vector2dF transform_scales = MathUtil::ComputeTransform2dScaleComponents(
       DrawTransform(), default_scale);
   return std::max(transform_scales.x(), transform_scales.y());
 }
 
 }  // namespace cc