cc: Clean up RecordingSource API

cc/proto/layer.proto

 // Copyright 2015 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.
 
 syntax = "proto2";
 
+import "display_item.proto";
 import "layer_position_constraint.proto";
 import "point3f.proto";
 import "pointf.proto";
 import "recording_source.proto";
 import "region.proto";
 import "rect.proto";
 import "scroll_offset.proto";
 import "size.proto";
 import "skxfermode.proto";
 import "transform.proto";
@@ skipping 113 matching lines @@
 }
 
 message PictureLayerProperties {
   optional RecordingSource recording_source = 1;
   optional Region invalidation = 2;
   optional Rect last_updated_visible_layer_rect = 3;
   optional bool is_mask = 4;
   optional bool nearest_neighbor = 5;
 
   optional int64 update_source_frame_number = 6;
+
+  optional Rect recorded_viewport = 7;
+  optional DisplayItemList display_list = 8;
 }
 
 message SolidColorScrollbarLayerProperties {
   enum ScrollbarOrientation {
     HORIZONTAL = 0;
     VERTICAL = 1;
   };
 
   optional int32 scroll_layer_id = 1;
   optional int32 thumb_thickness = 2;
   optional int32 track_start = 3;
   optional bool is_left_side_vertical_scrollbar = 4;
   optional ScrollbarOrientation orientation = 5;
+  optional Rect recorded_viewport = 6;
+  optional DisplayItemList display_list = 7;
 }