Remove parts of //cc we aren't using

cc/layers/scrollbar_layer_impl_base.cc

Index: cc/layers/scrollbar_layer_impl_base.cc
diff --git a/cc/layers/scrollbar_layer_impl_base.cc b/cc/layers/scrollbar_layer_impl_base.cc
deleted file mode 100644
index 35e716bdbd85463479813f80344acbb51162d866..0000000000000000000000000000000000000000
--- a/cc/layers/scrollbar_layer_impl_base.cc
+++ /dev/null
@@ -1,262 +0,0 @@
-// Copyright 2013 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/scrollbar_layer_impl_base.h"
-
-#include <algorithm>
-#include "cc/trees/layer_tree_impl.h"
-#include "ui/gfx/geometry/rect_conversions.h"
-
-namespace cc {
-
-ScrollbarLayerImplBase::ScrollbarLayerImplBase(
-    LayerTreeImpl* tree_impl,
-    int id,
-    ScrollbarOrientation orientation,
-    bool is_left_side_vertical_scrollbar,
-    bool is_overlay)
-    : LayerImpl(tree_impl, id),
-      scroll_layer_(nullptr),
-      clip_layer_(nullptr),
-      is_overlay_scrollbar_(is_overlay),
-      thumb_thickness_scale_factor_(1.f),
-      current_pos_(0.f),
-      maximum_(0),
-      orientation_(orientation),
-      is_left_side_vertical_scrollbar_(is_left_side_vertical_scrollbar),
-      vertical_adjust_(0.f),
-      visible_to_total_length_ratio_(1.f) {
-}
-
-ScrollbarLayerImplBase::~ScrollbarLayerImplBase() {}
-
-void ScrollbarLayerImplBase::PushPropertiesTo(LayerImpl* layer) {
-  float active_opacity = layer->opacity();
-  bool active_hidden = layer->hide_layer_and_subtree();
-  LayerImpl::PushPropertiesTo(layer);
-  layer->SetOpacity(active_opacity);
-  layer->SetHideLayerAndSubtree(active_hidden);
-  DCHECK(layer->ToScrollbarLayer());
-  layer->ToScrollbarLayer()->set_is_overlay_scrollbar(is_overlay_scrollbar_);
-  PushScrollClipPropertiesTo(layer);
-}
-
-void ScrollbarLayerImplBase::PushScrollClipPropertiesTo(LayerImpl* layer) {
-  DCHECK(layer->ToScrollbarLayer());
-  layer->ToScrollbarLayer()->SetScrollLayerAndClipLayerByIds(ScrollLayerId(),
-                                                             ClipLayerId());
-}
-
-ScrollbarLayerImplBase* ScrollbarLayerImplBase::ToScrollbarLayer() {
-  return this;
-}
-
-namespace {
-
-typedef void (LayerImpl::*ScrollbarRegistrationOperation)(
-    ScrollbarLayerImplBase*);
-
-void RegisterScrollbarWithLayers(ScrollbarLayerImplBase* scrollbar,
-                                 LayerImpl* container_layer,
-                                 LayerImpl* scroll_layer,
-                                 ScrollbarRegistrationOperation operation) {
-  if (!container_layer || !scroll_layer)
-    return;
-
-  DCHECK(scrollbar);
-
-  // Scrollbars must be notifed of changes to their scroll and container layers
-  // and all scrollable layers in between.
-  for (LayerImpl* current_layer = scroll_layer;
-       current_layer && current_layer != container_layer->parent();
-       current_layer = current_layer->parent()) {
-    (current_layer->*operation)(scrollbar);
-  }
-}
-}  // namespace
-
-void ScrollbarLayerImplBase::SetScrollLayerAndClipLayerByIds(
-    int scroll_layer_id,
-    int clip_layer_id) {
-  LayerImpl* scroll_layer = layer_tree_impl()->LayerById(scroll_layer_id);
-  LayerImpl* clip_layer = layer_tree_impl()->LayerById(clip_layer_id);
-  if (scroll_layer_ == scroll_layer && clip_layer_ == clip_layer)
-    return;
-
-  RegisterScrollbarWithLayers(
-      this, clip_layer_, scroll_layer_, &LayerImpl::RemoveScrollbar);
-  scroll_layer_ = scroll_layer;
-  clip_layer_ = clip_layer;
-  RegisterScrollbarWithLayers(
-      this, clip_layer_, scroll_layer_, &LayerImpl::AddScrollbar);
-
-  ScrollbarParametersDidChange(false);
-}
-
-gfx::Rect ScrollbarLayerImplBase::ScrollbarLayerRectToContentRect(
-    const gfx::RectF& layer_rect) const {
-  // Don't intersect with the bounds as in LayerRectToContentRect() because
-  // layer_rect here might be in coordinates of the containing layer.
-  gfx::RectF content_rect = gfx::ScaleRect(layer_rect,
-      contents_scale_x(),
-      contents_scale_y());
-  return gfx::ToEnclosingRect(content_rect);
-}
-
-bool ScrollbarLayerImplBase::SetCurrentPos(float current_pos) {
-  if (current_pos_ == current_pos)
-    return false;
-  current_pos_ = current_pos;
-  NoteLayerPropertyChanged();
-  return true;
-}
-
-bool ScrollbarLayerImplBase::SetMaximum(int maximum) {
-  if (maximum_ == maximum)
-    return false;
-  maximum_ = maximum;
-  NoteLayerPropertyChanged();
-  return true;
-}
-
-bool ScrollbarLayerImplBase::CanScrollOrientation() const {
-  if (!scroll_layer_)
-    return false;
-  return scroll_layer_->user_scrollable(orientation()) && (0 < maximum());
-}
-
-bool ScrollbarLayerImplBase::SetVerticalAdjust(float vertical_adjust) {
-  if (vertical_adjust_ == vertical_adjust)
-    return false;
-  vertical_adjust_ = vertical_adjust;
-  NoteLayerPropertyChanged();
-  return true;
-}
-
-bool ScrollbarLayerImplBase::SetVisibleToTotalLengthRatio(float ratio) {
-  if (!IsThumbResizable())
-    return false;
-
-  if (visible_to_total_length_ratio_ == ratio)
-    return false;
-  visible_to_total_length_ratio_ = ratio;
-  NoteLayerPropertyChanged();
-  return true;
-}
-
-bool ScrollbarLayerImplBase::SetThumbThicknessScaleFactor(float factor) {
-  if (thumb_thickness_scale_factor_ == factor)
-    return false;
-  thumb_thickness_scale_factor_ = factor;
-  NoteLayerPropertyChanged();
-  return true;
-}
-
-gfx::Rect ScrollbarLayerImplBase::ComputeThumbQuadRect() const {
-  // Thumb extent is the length of the thumb in the scrolling direction, thumb
-  // thickness is in the perpendicular direction. Here's an example of a
-  // horizontal scrollbar - inputs are above the scrollbar, computed values
-  // below:
-  //
-  //    |<------------------- track_length_ ------------------->|
-  //
-  // |--| <-- start_offset
-  //
-  // +--+----------------------------+------------------+-------+--+
-  // |<||                            |##################|       ||>|
-  // +--+----------------------------+------------------+-------+--+
-  //
-  //                                 |<- thumb_length ->|
-  //
-  // |<------- thumb_offset -------->|
-  //
-  // For painted, scrollbars, the length is fixed. For solid color scrollbars we
-  // have to compute it. The ratio of the thumb's length to the track's length
-  // is the same as that of the visible viewport to the total viewport, unless
-  // that would make the thumb's length less than its thickness.
-  //
-  // vertical_adjust_ is used when the layer geometry from the main thread is
-  // not in sync with what the user sees. For instance on Android scrolling the
-  // top bar controls out of view reveals more of the page content. We want the
-  // root layer scrollbars to reflect what the user sees even if we haven't
-  // received new layer geometry from the main thread.  If the user has scrolled
-  // down by 50px and the initial viewport size was 950px the geometry would
-  // look something like this:
-  //
-  // vertical_adjust_ = 50, scroll position 0, visible ratios 99%
-  // Layer geometry:             Desired thumb positions:
-  // +--------------------+-+   +----------------------+   <-- 0px
-  // |                    |v|   |                     #|
-  // |                    |e|   |                     #|
-  // |                    |r|   |                     #|
-  // |                    |t|   |                     #|
-  // |                    |i|   |                     #|
-  // |                    |c|   |                     #|
-  // |                    |a|   |                     #|
-  // |                    |l|   |                     #|
-  // |                    | |   |                     #|
-  // |                    |l|   |                     #|
-  // |                    |a|   |                     #|
-  // |                    |y|   |                     #|
-  // |                    |e|   |                     #|
-  // |                    |r|   |                     #|
-  // +--------------------+-+   |                     #|
-  // | horizontal  layer  | |   |                     #|
-  // +--------------------+-+   |                     #|  <-- 950px
-  // |                      |   |                     #|
-  // |                      |   |##################### |
-  // +----------------------+   +----------------------+  <-- 1000px
-  //
-  // The layer geometry is set up for a 950px tall viewport, but the user can
-  // actually see down to 1000px. Thus we have to move the quad for the
-  // horizontal scrollbar down by the vertical_adjust_ factor and lay the
-  // vertical thumb out on a track lengthed by the vertical_adjust_ factor. This
-  // means the quads may extend outside the layer's bounds.
-
-  // With the length known, we can compute the thumb's position.
-  float track_length = TrackLength();
-  int thumb_length = ThumbLength();
-  int thumb_thickness = ThumbThickness();
-
-  // With the length known, we can compute the thumb's position.
-  float clamped_current_pos =
-      std::min(std::max(current_pos_, 0.f), static_cast<float>(maximum_));
-
-  int thumb_offset = TrackStart();
-  if (maximum_ > 0) {
-    float ratio = clamped_current_pos / maximum_;
-    float max_offset = track_length - thumb_length;
-    thumb_offset += static_cast<int>(ratio * max_offset);
-  }
-
-  float thumb_thickness_adjustment =
-      thumb_thickness * (1.f - thumb_thickness_scale_factor_);
-
-  gfx::RectF thumb_rect;
-  if (orientation_ == HORIZONTAL) {
-    thumb_rect = gfx::RectF(thumb_offset,
-                            vertical_adjust_ + thumb_thickness_adjustment,
-                            thumb_length,
-                            thumb_thickness - thumb_thickness_adjustment);
-  } else {
-    thumb_rect = gfx::RectF(
-        is_left_side_vertical_scrollbar_
-            ? bounds().width() - thumb_thickness
-            : thumb_thickness_adjustment,
-        thumb_offset,
-        thumb_thickness - thumb_thickness_adjustment,
-        thumb_length);
-  }
-
-  return ScrollbarLayerRectToContentRect(thumb_rect);
-}
-
-void ScrollbarLayerImplBase::ScrollbarParametersDidChange(bool on_resize) {
-  if (!clip_layer_ || !scroll_layer_)
-    return;
-
-  scroll_layer_->SetScrollbarPosition(this, clip_layer_, on_resize);
-}
-
-}  // namespace cc