First Implementation of Snapped Points

cc/layers/layer.h

 // Copyright 2010 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_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
 #include "cc/base/filter_operations.h"
 #include "cc/base/region.h"
 #include "cc/benchmarks/micro_benchmark.h"
 #include "cc/cc_export.h"
 #include "cc/input/input_handler.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_position_constraint.h"
+#include "cc/layers/snap_point_list.h"
 #include "cc/paint/paint_record.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/mutator_host_client.h"
 #include "cc/trees/property_tree.h"
 #include "cc/trees/target_property.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/geometry/point3_f.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/rect_f.h"
 #include "ui/gfx/geometry/scroll_offset.h"
@@ skipping 70 matching lines @@
   void SetSafeOpaqueBackgroundColor(SkColor background_color);
   // If contents_opaque(), return an opaque color else return a
   // non-opaque color.  Tries to return background_color(), if possible.
   SkColor SafeOpaqueBackgroundColor() const;
 
   // A layer's bounds are in logical, non-page-scaled pixels (however, the
   // root layer's bounds are in physical pixels).
   void SetBounds(const gfx::Size& bounds);
   gfx::Size bounds() const { return inputs_.bounds; }
 
+  void SetScrollSnapOffsets(const SnapPointList& offsets);
+  SnapPointList snap_offsets() { return inputs_.snap_offsets; }
   void SetMasksToBounds(bool masks_to_bounds);
   bool masks_to_bounds() const { return inputs_.masks_to_bounds; }
 
   void SetMaskLayer(Layer* mask_layer);
   Layer* mask_layer() { return inputs_.mask_layer.get(); }
   const Layer* mask_layer() const { return inputs_.mask_layer.get(); }
 
   virtual void SetNeedsDisplayRect(const gfx::Rect& dirty_rect);
   void SetNeedsDisplay() { SetNeedsDisplayRect(gfx::Rect(bounds())); }
 
@@ skipping 459 matching lines @@
     Layer* clip_parent;
 
     bool has_will_change_transform_hint : 1;
 
     bool hide_layer_and_subtree : 1;
 
     // The following elements can not and are not serialized.
     LayerClient* client;
     base::Callback<void(const gfx::ScrollOffset&)> did_scroll_callback;
     std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;
+
+    SnapPointList snap_offsets;
   };
 
   Layer* parent_;
 
   // Layer instances have a weak pointer to their LayerTreeHost.
   // This pointer value is nil when a Layer is not in a tree and is
   // updated via SetLayerTreeHost() if a layer moves between trees.
   LayerTreeHost* layer_tree_host_;
 
   Inputs inputs_;
@@ skipping 24 matching lines @@
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_