Remove parts of //cc we aren't using

cc/layers/layer_utils.cc

-// Copyright 2014 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_utils.h"
-
-#include "cc/layers/layer_impl.h"
-#include "cc/trees/layer_tree_host_common.h"
-#include "ui/gfx/geometry/box_f.h"
-
-namespace cc {
-
-namespace {
-
-bool HasAnimationThatInflatesBounds(const LayerImpl& layer) {
-  return layer.layer_animation_controller()->HasAnimationThatInflatesBounds();
-}
-
-bool HasFilterAnimationThatInflatesBounds(const LayerImpl& layer) {
-  return layer.layer_animation_controller()
-      ->HasFilterAnimationThatInflatesBounds();
-}
-
-bool HasTransformAnimationThatInflatesBounds(const LayerImpl& layer) {
-  return layer.layer_animation_controller()
-      ->HasTransformAnimationThatInflatesBounds();
-}
-
-inline bool HasAncestorTransformAnimation(const LayerImpl& layer) {
-  return layer.screen_space_transform_is_animating();
-}
-
-inline bool HasAncestorFilterAnimation(const LayerImpl& layer) {
-  for (const LayerImpl* current = &layer; current;
-       current = current->parent()) {
-    if (HasFilterAnimationThatInflatesBounds(*current))
-        return true;
-  }
-
-  return false;
-}
-
-}  // namespace
-
-bool LayerUtils::GetAnimationBounds(const LayerImpl& layer_in, gfx::BoxF* out) {
-  // We don't care about animated bounds for invisible layers.
-  if (!layer_in.DrawsContent())
-    return false;
-
-  // We also don't care for layers that are not animated or a child of an
-  // animated layer.
-  if (!HasAncestorTransformAnimation(layer_in) &&
-      !HasAncestorFilterAnimation(layer_in))
-    return false;
-
-  // To compute the inflated bounds for a layer, we start by taking its bounds
-  // and converting it to a 3d box, and then we transform or inflate it
-  // repeatedly as we walk up the layer tree to the root.
-  //
-  // At each layer we apply the following transformations to the box:
-  //   1) We translate so that the anchor point is the origin.
-  //   2) We either apply the layer's transform or inflate if the layer's
-  //      transform is animated.
-  //   3) We undo the translation from step 1 and apply a second translation
-  //      to account for the layer's position.
-  //
-  gfx::BoxF box(layer_in.bounds().width(), layer_in.bounds().height(), 0.f);
-
-  // We want to inflate/transform the box as few times as possible. Each time
-  // we do this, we have to make the box axis aligned again, so if we make many
-  // small adjustments to the box by transforming it repeatedly rather than
-  // once by the product of all these matrices, we will accumulate a bunch of
-  // unnecessary inflation because of the the many axis-alignment fixes. This
-  // matrix stores said product.
-  gfx::Transform coalesced_transform;
-
-  for (const LayerImpl* layer = &layer_in; layer; layer = layer->parent()) {
-    int transform_origin_x = layer->transform_origin().x();
-    int transform_origin_y = layer->transform_origin().y();
-    int transform_origin_z = layer->transform_origin().z();
-
-    gfx::PointF position = layer->position();
-    if (layer->parent() && !HasAnimationThatInflatesBounds(*layer)) {
-      // |composite_layer_transform| contains 1 - 4 mentioned above. We compute
-      // it separately and apply afterwards because it's a bit more efficient
-      // because post-multiplication appears a bit more expensive, so we want
-      // to do it only once.
-      gfx::Transform composite_layer_transform;
-
-      composite_layer_transform.Translate3d(transform_origin_x + position.x(),
-                                            transform_origin_y + position.y(),
-                                            transform_origin_z);
-      composite_layer_transform.PreconcatTransform(layer->transform());
-      composite_layer_transform.Translate3d(
-          -transform_origin_x, -transform_origin_y, -transform_origin_z);
-
-      // Add this layer's contributions to the |coalesced_transform|.
-      coalesced_transform.ConcatTransform(composite_layer_transform);
-      continue;
-    }
-
-    // First, apply coalesced transform we've been building and reset it.
-    coalesced_transform.TransformBox(&box);
-    coalesced_transform.MakeIdentity();
-
-    // We need to apply the inflation about the layer's anchor point. Rather
-    // than doing this via transforms, we'll just shift the box directly.
-    box.set_origin(box.origin() + gfx::Vector3dF(-transform_origin_x,
-                                                 -transform_origin_y,
-                                                 -transform_origin_z));
-
-    // Perform the inflation
-    if (HasFilterAnimationThatInflatesBounds(*layer)) {
-      gfx::BoxF inflated;
-      if (!layer->layer_animation_controller()->FilterAnimationBoundsForBox(
-              box, &inflated))
-        return false;
-      box = inflated;
-    }
-
-    if (HasTransformAnimationThatInflatesBounds(*layer)) {
-      gfx::BoxF inflated;
-      if (!layer->layer_animation_controller()->TransformAnimationBoundsForBox(
-              box, &inflated))
-        return false;
-      box = inflated;
-    }
-
-    // Apply step 3) mentioned above.
-    box.set_origin(box.origin() +
-                   gfx::Vector3dF(transform_origin_x + position.x(),
-                                  transform_origin_y + position.y(),
-                                  transform_origin_z));
-  }
-
-  // If we've got an unapplied coalesced transform at this point, it must still
-  // be applied.
-  if (!coalesced_transform.IsIdentity())
-    coalesced_transform.TransformBox(&box);
-
-  *out = box;
-
-  return true;
-}
-
-}  // namespace cc