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

webkit/renderer/compositor_bindings/web_scrollbar_layer_impl.cc

 // Copyright 2012 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 "webkit/renderer/compositor_bindings/web_scrollbar_layer_impl.h"
 
 #include "cc/layers/scrollbar_layer.h"
+#include "cc/layers/scrollbar_layer_base.h"
+#include "cc/layers/solid_color_scrollbar_layer.h"
 #include "third_party/WebKit/public/platform/WebScrollbar.h"
 #include "webkit/renderer/compositor_bindings/scrollbar_impl.h"
 #include "webkit/renderer/compositor_bindings/web_layer_impl.h"
 
 using cc::ScrollbarLayer;
+using cc::SolidColorScrollbarLayer;
+
+#if defined(OS_ANDROID)
+namespace {
+
+cc::ScrollbarOrientation convertOrientation(

[tfarina, 2013/07/04 17:34:45]

CamelCase

[wjmaclean, 2013/07/04 17:50:11]

Done.

+    WebKit::WebScrollbar::Orientation orientation) {
+  if (orientation == WebKit::WebScrollbar::Horizontal)

[tfarina, 2013/07/04 17:34:45]

I know if/else is clear, but I'd just use the ternary operator ?: here.

[wjmaclean, 2013/07/04 17:50:11]

Done.

+    return cc::HORIZONTAL;
+  else
+    return cc::VERTICAL;
+}
+
+const int solid_color_scrollbar_thumb_thickness = 3;

[tfarina, 2013/07/04 17:34:45]

kFoo

[wjmaclean, 2013/07/04 17:50:11]

Done.

+const SkColor solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);

[tfarina, 2013/07/04 17:34:45]

kFoo

[wjmaclean, 2013/07/04 17:50:11]

Done.

+
+}  // namespace
+#endif
 
 namespace webkit {
 
 WebScrollbarLayerImpl::WebScrollbarLayerImpl(
     WebKit::WebScrollbar* scrollbar,
     WebKit::WebScrollbarThemePainter painter,
     WebKit::WebScrollbarThemeGeometry* geometry)
+#if defined(OS_ANDROID)
+    : layer_(new WebLayerImpl(SolidColorScrollbarLayer::Create(
+          convertOrientation(scrollbar->orientation()),
+          solid_color_scrollbar_thumb_thickness,
+          solid_color_scrollbar_color,
+          0))) {}
+#else
     : layer_(new WebLayerImpl(ScrollbarLayer::Create(
           scoped_ptr<cc::Scrollbar>(new ScrollbarImpl(
               make_scoped_ptr(scrollbar),
               painter,
               make_scoped_ptr(geometry))).Pass(), 0))) {}
+#endif
 
 WebScrollbarLayerImpl::~WebScrollbarLayerImpl() {}
 
 WebKit::WebLayer* WebScrollbarLayerImpl::layer() { return layer_.get(); }
 
 void WebScrollbarLayerImpl::setScrollLayer(WebKit::WebLayer* layer) {
   int id = layer ? static_cast<WebLayerImpl*>(layer)->layer()->id() : 0;
-  static_cast<ScrollbarLayer*>(layer_->layer())->SetScrollLayerId(id);
+  layer_->layer()->ToScrollbarLayerBase()->SetScrollLayerId(id);
 }
 
 }  // namespace webkit