Add DCLayerOverlayProcessor and supporting DCLayer structures.

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"
+
+namespace ui {
+
+DCRendererLayerParams::DCRendererLayerParams(bool is_clipped,
+                                             const gfx::Rect clip_rect,
+                                             unsigned sorting_context_id,
+                                             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),
+      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