cc: Construct the RSLL without using layer hierarchy

cc/layers/layer_impl.h

 // Copyright 2011 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_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 530 matching lines @@
 
   const SyncedScrollOffset* synced_scroll_offset() const;
   SyncedScrollOffset* synced_scroll_offset();
 
   // Get the correct invalidation region instead of conservative Rect
   // for layers that provide it.
   virtual Region GetInvalidationRegionForDebugging();
 
   virtual gfx::Rect GetEnclosingRectInTargetSpace() const;
 
-  void set_layer_or_descendant_is_drawn(bool layer_or_descendant_is_drawn) {
-    layer_or_descendant_is_drawn_ = layer_or_descendant_is_drawn;
+  void set_scrolls_drawn_descendant(bool scrolls_drawn_descendant) {
+    scrolls_drawn_descendant_ = scrolls_drawn_descendant;
   }
 
-  bool layer_or_descendant_is_drawn() { return layer_or_descendant_is_drawn_; }
+  bool scrolls_drawn_descendant() { return scrolls_drawn_descendant_; }
 
   void set_layer_or_descendant_has_touch_handler(
       bool layer_or_descendant_has_touch_handler) {
     layer_or_descendant_has_touch_handler_ =
         layer_or_descendant_has_touch_handler;
   }
 
   bool layer_or_descendant_has_touch_handler() {
     return layer_or_descendant_has_touch_handler_;
   }
@@ skipping 181 matching lines @@
 
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
       owned_debug_info_;
   base::trace_event::ConvertableToTraceFormat* debug_info_;
   std::unique_ptr<RenderSurfaceImpl> render_surface_;
 
   bool force_render_surface_;
 
   std::vector<FrameTimingRequest> frame_timing_requests_;
   bool frame_timing_requests_dirty_;
-  bool layer_or_descendant_is_drawn_;
+  bool scrolls_drawn_descendant_;
   // If true, the layer or one of its descendants has a touch handler.
   bool layer_or_descendant_has_touch_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_