Add DCLayerOverlayProcessor and supporting DCLayer structures.

cc/output/dc_layer_overlay.h

Index: cc/output/dc_layer_overlay.h
diff --git a/cc/output/dc_layer_overlay.h b/cc/output/dc_layer_overlay.h
new file mode 100644
index 0000000000000000000000000000000000000000..fe489280ffb7fa0d20d2d3533131781d886fc7f4
--- /dev/null
+++ b/cc/output/dc_layer_overlay.h
@@ -0,0 +1,46 @@
+// 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.
+
+#ifndef CC_OUTPUT_DC_LAYER_OVERLAY_H_
+#define CC_OUTPUT_DC_LAYER_OVERLAY_H_
+
+#include "cc/output/ca_layer_overlay.h"
+
+namespace cc {
+
+class DCLayerOverlayProcessor {
+ public:
+  enum DCLayerResult {
+    DC_LAYER_SUCCESS,
+    DC_LAYER_FAILED_QUAD_BLEND_MODE,
+    DC_LAYER_FAILED_TEXTURE_NOT_CANDIDATE,
+    DC_LAYER_FAILED_OCCLUDED,
+    DC_LAYER_FAILED_UNKNOWN
+  };
+
+  void Process(ResourceProvider* resource_provider,
+               const gfx::RectF& display_rect,
+               QuadList* quad_list,
+               gfx::Rect* overlay_damage_rect,
+               gfx::Rect* damage_rect,
+               CALayerOverlayList* ca_layer_overlays);
+  void ClearOverlayState() {
+    previous_frame_underlay_rect_ = gfx::Rect();
+    previous_occlusion_bounding_box_ = gfx::Rect();
+  }
+
+ private:
+  DCLayerResult FromDrawQuad(ResourceProvider* resource_provider,
+                             const gfx::RectF& display_rect,
+                             QuadList::ConstIterator quad_list_begin,
+                             QuadList::ConstIterator quad,
+                             CALayerOverlay* ca_layer_overlay);
+
+  gfx::Rect previous_frame_underlay_rect_;
+  gfx::Rect previous_occlusion_bounding_box_;
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_DC_LAYER_OVERLAY_H_