cc: Introduce embedded_surfaces in metadata for surface Ids in draw quads

cc/layers/append_quads_data.h

 // 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.
 
 #ifndef CC_LAYERS_APPEND_QUADS_DATA_H_
 #define CC_LAYERS_APPEND_QUADS_DATA_H_
 
 #include <stdint.h>
+#include <vector>
+
+#include "cc/cc_export.h"
+#include "cc/surfaces/surface_id.h"
 
 namespace cc {
 
 // Set by the layer appending quads.
-struct AppendQuadsData {
+class CC_EXPORT AppendQuadsData {
+ public:
+  AppendQuadsData();
+  ~AppendQuadsData();
+
   int64_t num_incomplete_tiles = 0;
   int64_t num_missing_tiles = 0;
   int64_t visible_layer_area = 0;
   int64_t approximated_visible_content_area = 0;
 
   // This is total of the following two areas.
   int64_t checkerboarded_visible_content_area = 0;
   // This is the area outside interest rect.
   int64_t checkerboarded_no_recording_content_area = 0;
   // This is the area within interest rect.
   int64_t checkerboarded_needs_raster_content_area = 0;
+
+  std::vector<SurfaceId> embedded_surfaces;

[danakj, 2017/04/07 16:41:17]

Comment explaining what this is so layer authors can know what to do with it

[Fady Samuel, 2017/04/07 17:16:26]

Done.

 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_APPEND_QUADS_DATA_H_