Blend TextureLayer background-color at draw time.

cc/layers/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 "cc/layers/scrollbar_layer_impl.h"
 
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/quad_sink.h"
 #include "cc/quads/solid_color_draw_quad.h"
@@ skipping 100 matching lines @@
     gfx::Rect opaque_rect;
     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
     quad->SetNew(shared_quad_state,
                  thumb_quad_rect,
                  opaque_rect,
                  thumb_resource_id_,
                  premultipled_alpha,
                  uv_top_left,
                  uv_bottom_right,
+                 SK_ColorTRANSPARENT,
                  opacity,
                  flipped);
     quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
   }
 
   if (!track_resource_id_)
     return;
 
   // Order matters here: since the back track texture is being drawn to the
   // entire contents rect, we must append it after the thumb and fore track
   // quads. The back track texture contains (and displays) the buttons.
   if (!content_bounds_rect.IsEmpty()) {
     gfx::Rect quad_rect(content_bounds_rect);
     gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
     const float opacity[] = {1.0f, 1.0f, 1.0f, 1.0f};
     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
     quad->SetNew(shared_quad_state,
                  quad_rect,
                  opaque_rect,
                  track_resource_id_,
                  premultipled_alpha,
                  uv_top_left,
                  uv_bottom_right,
+                 SK_ColorTRANSPARENT,
                  opacity,
                  flipped);
     quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
   }
 }
 
 ScrollbarOrientation ScrollbarLayerImpl::Orientation() const {
   return orientation_;
 }
 
@@ skipping 107 matching lines @@
 void ScrollbarLayerImpl::DidLoseOutputSurface() {
   track_resource_id_ = 0;
   thumb_resource_id_ = 0;
 }
 
 const char* ScrollbarLayerImpl::LayerTypeAsString() const {
   return "cc::ScrollbarLayerImpl";
 }
 
 }  // namespace cc