Add DirectComposition overlay support.

ui/gl/dc_renderer_layer_params.cc

 // Copyright 2017 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 "ui/gl/dc_renderer_layer_params.h"
 
+#include "ui/gl/gl_image.h"
+
 namespace ui {
 
 DCRendererLayerParams::DCRendererLayerParams(bool is_clipped,
                                              const gfx::Rect clip_rect,
-                                             unsigned sorting_context_id,
+                                             int z_order,
                                              const gfx::Transform& transform,
                                              gl::GLImage* image,
                                              const gfx::RectF& contents_rect,
                                              const gfx::Rect& rect,
                                              unsigned background_color,
                                              unsigned edge_aa_mask,
                                              float opacity,
                                              unsigned filter)
     : is_clipped(is_clipped),
       clip_rect(clip_rect),
-      sorting_context_id(sorting_context_id),
+      z_order(z_order),
       transform(transform),
       image(image),
       contents_rect(contents_rect),
       rect(rect),
       background_color(background_color),
       edge_aa_mask(edge_aa_mask),
       opacity(opacity),
       filter(filter) {}
 
 DCRendererLayerParams::DCRendererLayerParams(
     const DCRendererLayerParams& other) = default;
 DCRendererLayerParams::~DCRendererLayerParams() = default;
 
 }  // namespace ui