Refactor cc scrollbar layers to separate solid-color vs desktop.

cc/layers/solid_color_scrollbar_layer_impl.cc

Index: cc/layers/solid_color_scrollbar_layer_impl.cc
diff --git a/cc/layers/solid_color_scrollbar_layer_impl.cc b/cc/layers/solid_color_scrollbar_layer_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..68812eea4a660980eeabfa474b162d3e8d6075e5
--- /dev/null
+++ b/cc/layers/solid_color_scrollbar_layer_impl.cc
@@ -0,0 +1,92 @@
+// 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/quad_sink.h"
+#include "cc/layers/solid_color_scrollbar_layer_impl.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "cc/trees/layer_tree_impl.h"
+#include "cc/trees/layer_tree_settings.h"
+
+namespace cc {
+
+scoped_ptr<SolidColorScrollbarLayerImpl> SolidColorScrollbarLayerImpl::Create(
+    LayerTreeImpl* tree_impl,
+    int id,
+    ScrollbarOrientation orientation,
+    int thumb_thickness) {
+  return make_scoped_ptr(new SolidColorScrollbarLayerImpl(
+      tree_impl, id, orientation, thumb_thickness));
+}
+
+SolidColorScrollbarLayerImpl::~SolidColorScrollbarLayerImpl() {}
+
+scoped_ptr<LayerImpl> SolidColorScrollbarLayerImpl::CreateLayerImpl(
+    LayerTreeImpl* tree_impl) {
+  return SolidColorScrollbarLayerImpl::Create(
+      tree_impl, id(), orientation(), thumb_thickness_).PassAs<LayerImpl>();
+}
+
+SolidColorScrollbarLayerImpl::SolidColorScrollbarLayerImpl(
+    LayerTreeImpl* tree_impl,
+    int id,
+    ScrollbarOrientation orientation,
+    int thumb_thickness)
+    : ScrollbarLayerImplBase(tree_impl, id, orientation),
+      thumb_thickness_(thumb_thickness),
+      color_(tree_impl->settings().solid_color_scrollbar_color) {}
+
+void SolidColorScrollbarLayerImpl::PushPropertiesTo(LayerImpl* layer) {
+  ScrollbarLayerImplBase::PushPropertiesTo(layer);
+}
+
+int SolidColorScrollbarLayerImpl::ThumbThickness() const {
+  // TODO(wjmaclean) This should be removed when
+  // solid_color_scrollbar_thickness_dip is removed.
+  int thickness_override =
+      layer_tree_impl()
+          ? layer_tree_impl()->settings().solid_color_scrollbar_thickness_dip
+          : -1;
+  if (thickness_override != -1)
+    return thickness_override;
+
+  if (thumb_thickness_ != -1)
+    return thumb_thickness_;
+
+  if (orientation() == HORIZONTAL)
+    return bounds().height();
+  else
+    return bounds().width();
+}
+
+int SolidColorScrollbarLayerImpl::ThumbLength() const {
+  return std::max(
+      static_cast<int>(visible_to_total_length_ratio() * TrackLength()),
+      ThumbThickness());
+}
+
+float SolidColorScrollbarLayerImpl::TrackLength() const {
+  if (orientation() == HORIZONTAL)
+    return bounds().width();
+  else
+    return bounds().height() + vertical_adjust();
+}
+
+int SolidColorScrollbarLayerImpl::TrackStart() const {
+  return 0;
+}
+
+void SolidColorScrollbarLayerImpl::AppendQuads(QuadSink* quad_sink,
+                           AppendQuadsData* append_quads_data) {
+  gfx::Rect thumb_quad_rect = ComputeThumbQuadRect();
+
+  SharedQuadState* shared_quad_state =
+      quad_sink->UseSharedQuadState(CreateSharedQuadState());
+  AppendDebugBorderQuad(quad_sink, shared_quad_state, append_quads_data);
+
+  scoped_ptr<SolidColorDrawQuad> quad = SolidColorDrawQuad::Create();
+  quad->SetNew(shared_quad_state, thumb_quad_rect, color_, false);
+  quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
+}
+
+}  // namespace cc