Force use of and cache render surface.

components/viz/service/display/surface_aggregator.h

 // Copyright 2014 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 COMPONENTS_VIZ_SERVICE_DISPLAY_SURFACE_AGGREGATOR_H_
 #define COMPONENTS_VIZ_SERVICE_DISPLAY_SURFACE_AGGREGATOR_H_
 
 #include <memory>
 #include <unordered_map>
 
@@ skipping 183 matching lines @@
   cc::RenderPassList* dest_pass_list_;
 
   // This is the set of aggregated pass ids that are affected by filters that
   // move pixels.
   base::flat_set<cc::RenderPassId> moved_pixel_passes_;
 
   // This is the set of aggregated pass ids that are drawn by copy requests, so
   // should not have their damage rects clipped to the root damage rect.
   base::flat_set<cc::RenderPassId> copy_request_passes_;
 
+  // This is the set of aggregated pass ids that has damage from contributing
+  // content.
+  base::flat_set<cc::RenderPassId> contributing_content_damaged_passes_;
+
   // This maps each aggregated pass id to the set of (aggregated) pass ids
   // that its cc::RenderPassDrawQuads depend on
   base::flat_map<cc::RenderPassId, base::flat_set<cc::RenderPassId>>
       render_pass_dependencies_;
 
   // The root damage rect of the currently-aggregating frame.
   gfx::Rect root_damage_rect_;
 
   // True if the frame that's currently being aggregated has copy requests.
   // This is valid during Aggregate after PrewalkTree is called.
   bool has_copy_requests_;
 
+  // True if the frame that's currently being aggregated has cached render
+  // passes. This is valid during Aggregate after PrewalkTree is called.
+  bool has_cached_render_passes_;
+
   // Tracks UMA stats for SurfaceDrawQuads during a call to Aggregate().
   SurfaceDrawQuadUmaStats uma_stats_;
 
   base::WeakPtrFactory<SurfaceAggregator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceAggregator);
 };
 
 }  // namespace viz
 
 #endif  // COMPONENTS_VIZ_SERVICE_DISPLAY_SURFACE_AGGREGATOR_H_