Remove GraphicsLayer::didScroll and directly call ScrollableArea::didScroll

ui/compositor/layer.cc

 // Copyright (c) 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 "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 802 matching lines @@
   if (layer_mask_)
     layer_mask_->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
 void Layer::OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) {
   DCHECK(surface_layer_.get());
   if (delegate_)
     delegate_->OnDelegatedFrameDamage(damage_rect_in_dip);
 }
 
-void Layer::SetScrollable(Layer* parent_clip_layer,
-                          const base::Closure& on_scroll) {
+void Layer::SetScrollable(
+    Layer* parent_clip_layer,
+    const base::Callback<void(const gfx::ScrollOffset&)>& on_scroll) {
   cc_layer_->SetScrollClipLayerId(parent_clip_layer->cc_layer_->id());
   cc_layer_->set_did_scroll_callback(on_scroll);
   cc_layer_->SetUserScrollable(true, true);
 }
 
 gfx::ScrollOffset Layer::CurrentScrollOffset() const {
   const Compositor* compositor = GetCompositor();
   gfx::ScrollOffset offset;
   if (compositor &&
       compositor->GetScrollOffsetForLayer(cc_layer_->id(), &offset))
@@ skipping 337 matching lines @@
   const auto it = std::find_if(mirrors_.begin(), mirrors_.end(),
       [mirror](const std::unique_ptr<LayerMirror>& mirror_ptr) {
         return mirror_ptr.get() == mirror;
       });
 
   DCHECK(it != mirrors_.end());
   mirrors_.erase(it);
 }
 
 }  // namespace ui