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

cc/layers/solid_color_scrollbar_layer.cc

+// 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/solid_color_scrollbar_layer.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "cc/layers/layer_impl.h"
+#include "cc/layers/solid_color_scrollbar_layer_impl.h"
+
+namespace cc {
+
+scoped_ptr<LayerImpl> SolidColorScrollbarLayer::CreateLayerImpl(
+    LayerTreeImpl* tree_impl) {
+  return SolidColorScrollbarLayerImpl::Create(
+      tree_impl, id(), orientation(), thumb_thickness_, color_)
+      .PassAs<LayerImpl>();
+}
+
+scoped_refptr<SolidColorScrollbarLayer> SolidColorScrollbarLayer::Create(
+    ScrollbarOrientation orientation,
+    int thumb_thickness,
+    SkColor color,
+    int scroll_layer_id) {
+  return make_scoped_refptr(new SolidColorScrollbarLayer(orientation,
+                                                         thumb_thickness,
+                                                         color,
+                                                         scroll_layer_id));
+}
+
+SolidColorScrollbarLayer::SolidColorScrollbarLayer(
+    ScrollbarOrientation orientation,
+    int thumb_thickness,
+    SkColor color,
+    int scroll_layer_id)
+    : scroll_layer_id_(scroll_layer_id),
+      orientation_(orientation),
+      thumb_thickness_(thumb_thickness),
+      color_(color) {}
+
+SolidColorScrollbarLayer::~SolidColorScrollbarLayer() {}
+
+ScrollbarLayerInterface* SolidColorScrollbarLayer::ToScrollbarLayer() {
+  return this;
+}
+
+bool SolidColorScrollbarLayer::OpacityCanAnimateOnImplThread() const {
+  return true;
+}
+
+int SolidColorScrollbarLayer::scroll_layer_id() const {
+  return scroll_layer_id_;
+}
+
+void SolidColorScrollbarLayer::SetScrollLayerId(int id) {
+  if (id == scroll_layer_id_)
+    return;
+
+  scroll_layer_id_ = id;
+  SetNeedsFullTreeSync();
+}
+
+ScrollbarOrientation SolidColorScrollbarLayer::orientation() const {
+  return orientation_;
+}
+
+}  // namespace cc