Make all scrollable layers visible to hit testing.

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 405 matching lines @@
 
   void Set3dSortingContextId(int id);
   int sorting_context_id() { return sorting_context_id_; }
 
   // Get the correct invalidation region instead of conservative Rect
   // for layers that provide it.
   virtual Region GetInvalidationRegionForDebugging();
 
   virtual gfx::Rect GetEnclosingRectInTargetSpace() const;
 
-  void set_scrolls_drawn_descendant(bool scrolls_drawn_descendant) {
-    scrolls_drawn_descendant_ = scrolls_drawn_descendant;
-  }
-
-  bool scrolls_drawn_descendant() { return scrolls_drawn_descendant_; }
-
   int num_copy_requests_in_target_subtree();
 
   void UpdatePropertyTreeForScrollingAndAnimationIfNeeded();
 
   bool IsHidden() const;
 
   float GetIdealContentsScale() const;
 
   bool was_ever_ready_since_last_transform_animation() const {
     return was_ever_ready_since_last_transform_animation_;
@@ skipping 131 matching lines @@
   DrawProperties draw_properties_;
   PerformanceProperties<LayerImpl> performance_properties_;
 
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
       owned_debug_info_;
   base::trace_event::ConvertableToTraceFormat* debug_info_;
   std::unique_ptr<RenderSurfaceImpl> render_surface_;
   gfx::Size preferred_raster_bounds_;
 
   bool has_preferred_raster_bounds_ : 1;
-  bool scrolls_drawn_descendant_ : 1;
   bool has_will_change_transform_hint_ : 1;
   bool needs_push_properties_ : 1;
   bool scrollbars_hidden_ : 1;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_