cc: Move SyncedScrollOffset to scroll tree

cc/layers/picture_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/picture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 41 matching lines @@
 const int kTileRoundUp = 64;
 
 // For performance reasons and to support compressed tile textures, tile
 // width and height should be an even multiple of 4 in size.
 const int kTileMinimalAlignment = 4;
 
 }  // namespace
 
 namespace cc {
 
-PictureLayerImpl::PictureLayerImpl(
-    LayerTreeImpl* tree_impl,
-    int id,
-    bool is_mask,
-    scoped_refptr<SyncedScrollOffset> scroll_offset)
-    : LayerImpl(tree_impl, id, scroll_offset),
+PictureLayerImpl::PictureLayerImpl(LayerTreeImpl* tree_impl,
+                                   int id,
+                                   bool is_mask)
+    : LayerImpl(tree_impl, id),
       twin_layer_(nullptr),
       tilings_(CreatePictureLayerTilingSet()),
       ideal_page_scale_(0.f),
       ideal_device_scale_(0.f),
       ideal_source_scale_(0.f),
       ideal_contents_scale_(0.f),
       raster_page_scale_(0.f),
       raster_device_scale_(0.f),
       raster_source_scale_(0.f),
       raster_contents_scale_(0.f),
@@ skipping 10 matching lines @@
     twin_layer_->twin_layer_ = nullptr;
   layer_tree_impl()->UnregisterPictureLayerImpl(this);
 }
 
 const char* PictureLayerImpl::LayerTypeAsString() const {
   return "cc::PictureLayerImpl";
 }
 
 scoped_ptr<LayerImpl> PictureLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return PictureLayerImpl::Create(tree_impl, id(), is_mask_,
-                                  synced_scroll_offset());
+  return PictureLayerImpl::Create(tree_impl, id(), is_mask_);
 }
 
 void PictureLayerImpl::PushPropertiesTo(LayerImpl* base_layer) {
   PictureLayerImpl* layer_impl = static_cast<PictureLayerImpl*>(base_layer);
   DCHECK_EQ(layer_impl->is_mask_, is_mask_);
 
   LayerImpl::PushPropertiesTo(base_layer);
 
   // Twin relationships should never change once established.
   DCHECK(!twin_layer_ || twin_layer_ == layer_impl);
@@ skipping 1149 matching lines @@
 
 bool PictureLayerImpl::IsOnActiveOrPendingTree() const {
   return !layer_tree_impl()->IsRecycleTree();
 }
 
 bool PictureLayerImpl::HasValidTilePriorities() const {
   return IsOnActiveOrPendingTree() && IsDrawnRenderSurfaceLayerListMember();
 }
 
 }  // namespace cc