cc: Make PaintedScrollbarLayer not use ContentsScalingLayer

cc/layers/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 "cc/layers/layer_impl.h"
 
 #include "base/json/json_reader.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
@@ skipping 243 matching lines @@
 }
 
 void LayerImpl::PopulateSharedQuadState(SharedQuadState* state) const {
   state->SetAll(
       draw_properties_.target_space_transform, draw_properties_.content_bounds,
       draw_properties_.visible_content_rect, draw_properties_.clip_rect,
       draw_properties_.is_clipped, draw_properties_.opacity,
       draw_properties_.blend_mode, sorting_context_id_);
 }
 
+void LayerImpl::PopulateScaledSharedQuadState(SharedQuadState* state,
+                                              float scale) const {
+  gfx::Transform scaled_draw_transform =
+      draw_properties_.target_space_transform;
+  scaled_draw_transform.Scale(SK_MScalar1 / scale, SK_MScalar1 / scale);
+  gfx::Size scaled_content_bounds =
+      gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale));
+  gfx::Rect scaled_visible_content_rect =
+      gfx::ScaleToEnclosingRect(visible_content_rect(), scale);
+  scaled_visible_content_rect.Intersect(gfx::Rect(scaled_content_bounds));
+
+  state->SetAll(scaled_draw_transform, scaled_content_bounds,
+                scaled_visible_content_rect, draw_properties().clip_rect,
+                draw_properties().is_clipped, draw_properties().opacity,
+                draw_properties().blend_mode, sorting_context_id_);
+}
+
 bool LayerImpl::WillDraw(DrawMode draw_mode,
                          ResourceProvider* resource_provider) {
   // WillDraw/DidDraw must be matched.
   DCHECK_NE(DRAW_MODE_NONE, draw_mode);
   DCHECK_EQ(DRAW_MODE_NONE, current_draw_mode_);
   current_draw_mode_ = draw_mode;
   return true;
 }
 
 void LayerImpl::DidDraw(ResourceProvider* resource_provider) {
@@ skipping 1282 matching lines @@
   SetNeedsPushProperties();
   layer_tree_impl()->set_needs_update_draw_properties();
   if (should_have_render_surface) {
     render_surface_ = make_scoped_ptr(new RenderSurfaceImpl(this));
     return;
   }
   render_surface_.reset();
 }
 
 }  // namespace cc