Remove parts of //cc we aren't using

cc/trees/tree_synchronizer.cc

Index: cc/trees/tree_synchronizer.cc
diff --git a/cc/trees/tree_synchronizer.cc b/cc/trees/tree_synchronizer.cc
deleted file mode 100644
index 095195fd1a920b3f6a559d049de14b7d4920edee..0000000000000000000000000000000000000000
--- a/cc/trees/tree_synchronizer.cc
+++ /dev/null
@@ -1,311 +0,0 @@
-// Copyright 2011 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/trees/tree_synchronizer.h"
-
-#include <set>
-
-#include "base/containers/hash_tables.h"
-#include "base/containers/scoped_ptr_hash_map.h"
-#include "base/logging.h"
-#include "base/trace_event/trace_event.h"
-#include "cc/animation/scrollbar_animation_controller.h"
-#include "cc/input/scrollbar.h"
-#include "cc/layers/layer.h"
-#include "cc/layers/layer_impl.h"
-#include "cc/layers/scrollbar_layer_impl_base.h"
-#include "cc/layers/scrollbar_layer_interface.h"
-
-namespace cc {
-
-typedef base::ScopedPtrHashMap<int, LayerImpl> ScopedPtrLayerImplMap;
-typedef base::hash_map<int, LayerImpl*> RawPtrLayerImplMap;
-
-void CollectExistingLayerImplRecursive(ScopedPtrLayerImplMap* old_layers,
-                                       scoped_ptr<LayerImpl> layer_impl) {
-  if (!layer_impl)
-    return;
-
-  layer_impl->ClearScrollbars();
-  if (ScrollbarLayerImplBase* scrollbar_layer =
-          layer_impl->ToScrollbarLayer()) {
-    scrollbar_layer->ClearClipLayer();
-    scrollbar_layer->ClearScrollLayer();
-  }
-
-  OwnedLayerImplList& children = layer_impl->children();
-  for (OwnedLayerImplList::iterator it = children.begin();
-       it != children.end();
-       ++it)
-    CollectExistingLayerImplRecursive(old_layers, children.take(it));
-
-  CollectExistingLayerImplRecursive(old_layers, layer_impl->TakeMaskLayer());
-  CollectExistingLayerImplRecursive(old_layers, layer_impl->TakeReplicaLayer());
-
-  int id = layer_impl->id();
-  old_layers->set(id, layer_impl.Pass());
-}
-
-template <typename LayerType>
-scoped_ptr<LayerImpl> SynchronizeTreesInternal(
-    LayerType* layer_root,
-    scoped_ptr<LayerImpl> old_layer_impl_root,
-    LayerTreeImpl* tree_impl) {
-  DCHECK(tree_impl);
-
-  TRACE_EVENT0("cc", "TreeSynchronizer::SynchronizeTrees");
-  ScopedPtrLayerImplMap old_layers;
-  RawPtrLayerImplMap new_layers;
-
-  CollectExistingLayerImplRecursive(&old_layers, old_layer_impl_root.Pass());
-
-  scoped_ptr<LayerImpl> new_tree = SynchronizeTreesRecursive(
-      &new_layers, &old_layers, layer_root, tree_impl);
-
-  UpdateScrollbarLayerPointersRecursive(&new_layers, layer_root);
-
-  return new_tree.Pass();
-}
-
-scoped_ptr<LayerImpl> TreeSynchronizer::SynchronizeTrees(
-    Layer* layer_root,
-    scoped_ptr<LayerImpl> old_layer_impl_root,
-    LayerTreeImpl* tree_impl) {
-  return SynchronizeTreesInternal(
-      layer_root, old_layer_impl_root.Pass(), tree_impl);
-}
-
-scoped_ptr<LayerImpl> TreeSynchronizer::SynchronizeTrees(
-    LayerImpl* layer_root,
-    scoped_ptr<LayerImpl> old_layer_impl_root,
-    LayerTreeImpl* tree_impl) {
-  return SynchronizeTreesInternal(
-      layer_root, old_layer_impl_root.Pass(), tree_impl);
-}
-
-template <typename LayerType>
-scoped_ptr<LayerImpl> ReuseOrCreateLayerImpl(RawPtrLayerImplMap* new_layers,
-                                             ScopedPtrLayerImplMap* old_layers,
-                                             LayerType* layer,
-                                             LayerTreeImpl* tree_impl) {
-  scoped_ptr<LayerImpl> layer_impl = old_layers->take(layer->id());
-
-  if (!layer_impl)
-    layer_impl = layer->CreateLayerImpl(tree_impl);
-
-  (*new_layers)[layer->id()] = layer_impl.get();
-  return layer_impl.Pass();
-}
-
-template <typename LayerType>
-scoped_ptr<LayerImpl> SynchronizeTreesRecursiveInternal(
-    RawPtrLayerImplMap* new_layers,
-    ScopedPtrLayerImplMap* old_layers,
-    LayerType* layer,
-    LayerTreeImpl* tree_impl) {
-  if (!layer)
-    return nullptr;
-
-  scoped_ptr<LayerImpl> layer_impl =
-      ReuseOrCreateLayerImpl(new_layers, old_layers, layer, tree_impl);
-
-  layer_impl->ClearChildList();
-  for (size_t i = 0; i < layer->children().size(); ++i) {
-    layer_impl->AddChild(SynchronizeTreesRecursiveInternal(
-        new_layers, old_layers, layer->child_at(i), tree_impl));
-  }
-
-  layer_impl->SetMaskLayer(SynchronizeTreesRecursiveInternal(
-      new_layers, old_layers, layer->mask_layer(), tree_impl));
-  layer_impl->SetReplicaLayer(SynchronizeTreesRecursiveInternal(
-      new_layers, old_layers, layer->replica_layer(), tree_impl));
-
-  return layer_impl.Pass();
-}
-
-scoped_ptr<LayerImpl> SynchronizeTreesRecursive(
-    RawPtrLayerImplMap* new_layers,
-    ScopedPtrLayerImplMap* old_layers,
-    Layer* layer,
-    LayerTreeImpl* tree_impl) {
-  return SynchronizeTreesRecursiveInternal(
-      new_layers, old_layers, layer, tree_impl);
-}
-
-scoped_ptr<LayerImpl> SynchronizeTreesRecursive(
-    RawPtrLayerImplMap* new_layers,
-    ScopedPtrLayerImplMap* old_layers,
-    LayerImpl* layer,
-    LayerTreeImpl* tree_impl) {
-  return SynchronizeTreesRecursiveInternal(
-      new_layers, old_layers, layer, tree_impl);
-}
-
-template <typename LayerType, typename ScrollbarLayerType>
-void UpdateScrollbarLayerPointersRecursiveInternal(
-    const RawPtrLayerImplMap* new_layers,
-    LayerType* layer) {
-  if (!layer)
-    return;
-
-  for (size_t i = 0; i < layer->children().size(); ++i) {
-    UpdateScrollbarLayerPointersRecursiveInternal<
-        LayerType, ScrollbarLayerType>(new_layers, layer->child_at(i));
-  }
-
-  ScrollbarLayerType* scrollbar_layer = layer->ToScrollbarLayer();
-  if (!scrollbar_layer)
-    return;
-
-  RawPtrLayerImplMap::const_iterator iter =
-      new_layers->find(layer->id());
-  ScrollbarLayerImplBase* scrollbar_layer_impl =
-      iter != new_layers->end()
-          ? static_cast<ScrollbarLayerImplBase*>(iter->second)
-          : NULL;
-  DCHECK(scrollbar_layer_impl);
-
-  scrollbar_layer->PushScrollClipPropertiesTo(scrollbar_layer_impl);
-}
-
-void UpdateScrollbarLayerPointersRecursive(const RawPtrLayerImplMap* new_layers,
-                                           Layer* layer) {
-  UpdateScrollbarLayerPointersRecursiveInternal<Layer, ScrollbarLayerInterface>(
-      new_layers, layer);
-}
-
-void UpdateScrollbarLayerPointersRecursive(const RawPtrLayerImplMap* new_layers,
-                                           LayerImpl* layer) {
-  UpdateScrollbarLayerPointersRecursiveInternal<
-      LayerImpl,
-      ScrollbarLayerImplBase>(new_layers, layer);
-}
-
-// static
-template <typename LayerType>
-void TreeSynchronizer::PushPropertiesInternal(
-    LayerType* layer,
-    LayerImpl* layer_impl,
-    size_t* num_dependents_need_push_properties_for_parent) {
-  if (!layer) {
-    DCHECK(!layer_impl);
-    return;
-  }
-
-  DCHECK_EQ(layer->id(), layer_impl->id());
-
-  bool push_layer = layer->needs_push_properties();
-  bool recurse_on_children_and_dependents =
-      layer->descendant_needs_push_properties();
-
-  if (push_layer)
-    layer->PushPropertiesTo(layer_impl);
-  else if (layer->ToScrollbarLayer())
-    layer->ToScrollbarLayer()->PushScrollClipPropertiesTo(layer_impl);
-
-  size_t num_dependents_need_push_properties = 0;
-  if (recurse_on_children_and_dependents) {
-    PushPropertiesInternal(layer->mask_layer(),
-                           layer_impl->mask_layer(),
-                           &num_dependents_need_push_properties);
-    PushPropertiesInternal(layer->replica_layer(),
-                           layer_impl->replica_layer(),
-                           &num_dependents_need_push_properties);
-
-    const OwnedLayerImplList& impl_children = layer_impl->children();
-    DCHECK_EQ(layer->children().size(), impl_children.size());
-
-    for (size_t i = 0; i < layer->children().size(); ++i) {
-      PushPropertiesInternal(layer->child_at(i),
-                             impl_children[i],
-                             &num_dependents_need_push_properties);
-    }
-
-    // When PushPropertiesTo completes for a layer, it may still keep
-    // its needs_push_properties() state if the layer must push itself
-    // every PushProperties tree walk. Here we keep track of those layers, and
-    // ensure that their ancestors know about them for the next PushProperties
-    // tree walk.
-    layer->num_dependents_need_push_properties_ =
-        num_dependents_need_push_properties;
-  }
-
-  bool add_self_to_parent = num_dependents_need_push_properties > 0 ||
-                            layer->needs_push_properties();
-  *num_dependents_need_push_properties_for_parent += add_self_to_parent ? 1 : 0;
-}
-
-static void CheckScrollAndClipPointersRecursive(Layer* layer,
-                                                LayerImpl* layer_impl) {
-  DCHECK_EQ(!!layer, !!layer_impl);
-  if (!layer)
-    return;
-
-  // Having a scroll parent on the impl thread implies having one the main
-  // thread, too. The main thread may have a scroll parent that is not in the
-  // tree because it's been removed but not deleted. In this case, the layer
-  // impl will have no scroll parent. Same argument applies for clip parents and
-  // scroll/clip children.
-  DCHECK(!layer_impl->scroll_parent() || !!layer->scroll_parent());
-  DCHECK(!layer_impl->clip_parent() || !!layer->clip_parent());
-  DCHECK(!layer_impl->scroll_children() || !!layer->scroll_children());
-  DCHECK(!layer_impl->clip_children() || !!layer->clip_children());
-
-  if (layer_impl->scroll_parent())
-    DCHECK_EQ(layer->scroll_parent()->id(), layer_impl->scroll_parent()->id());
-
-  if (layer_impl->clip_parent())
-    DCHECK_EQ(layer->clip_parent()->id(), layer_impl->clip_parent()->id());
-
-  if (layer_impl->scroll_children()) {
-    for (std::set<Layer*>::iterator it = layer->scroll_children()->begin();
-         it != layer->scroll_children()->end();
-         ++it) {
-      DCHECK_EQ((*it)->scroll_parent(), layer);
-    }
-    for (std::set<LayerImpl*>::iterator it =
-             layer_impl->scroll_children()->begin();
-         it != layer_impl->scroll_children()->end();
-         ++it) {
-      DCHECK_EQ((*it)->scroll_parent(), layer_impl);
-    }
-  }
-
-  if (layer_impl->clip_children()) {
-    for (std::set<Layer*>::iterator it = layer->clip_children()->begin();
-         it != layer->clip_children()->end();
-         ++it) {
-      DCHECK_EQ((*it)->clip_parent(), layer);
-    }
-    for (std::set<LayerImpl*>::iterator it =
-             layer_impl->clip_children()->begin();
-         it != layer_impl->clip_children()->end();
-         ++it) {
-      DCHECK_EQ((*it)->clip_parent(), layer_impl);
-    }
-  }
-
-  for (size_t i = 0u; i < layer->children().size(); ++i) {
-    CheckScrollAndClipPointersRecursive(layer->child_at(i),
-                                        layer_impl->child_at(i));
-  }
-}
-
-void TreeSynchronizer::PushProperties(Layer* layer,
-                                      LayerImpl* layer_impl) {
-  size_t num_dependents_need_push_properties = 0;
-  PushPropertiesInternal(
-      layer, layer_impl, &num_dependents_need_push_properties);
-#if DCHECK_IS_ON()
-  CheckScrollAndClipPointersRecursive(layer, layer_impl);
-#endif
-}
-
-void TreeSynchronizer::PushProperties(LayerImpl* layer, LayerImpl* layer_impl) {
-  size_t num_dependents_need_push_properties = 0;
-  PushPropertiesInternal(
-      layer, layer_impl, &num_dependents_need_push_properties);
-}
-
-}  // namespace cc