Implement CSS: scroll-boundary-behavior

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>
 
 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/values.h"
 #include "cc/base/region.h"
 #include "cc/base/synced_property.h"
 #include "cc/cc_export.h"
 #include "cc/debug/layer_tree_debug_state.h"
 #include "cc/input/input_handler.h"
+#include "cc/input/scroll_boundary_behavior.h"
 #include "cc/layers/draw_properties.h"
 #include "cc/layers/layer_collections.h"
 #include "cc/layers/layer_impl_test_properties.h"
 #include "cc/layers/layer_position_constraint.h"
 #include "cc/layers/performance_properties.h"
 #include "cc/layers/render_surface_impl.h"
 #include "cc/quads/shared_quad_state.h"
 #include "cc/resources/resource_provider.h"
 #include "cc/tiles/tile_priority.h"
 #include "cc/trees/element_id.h"
@@ skipping 252 matching lines @@
     return static_cast<ViewportLayerType>(viewport_layer_type_);
   }
 
   void SetCurrentScrollOffset(const gfx::ScrollOffset& scroll_offset);
   gfx::ScrollOffset CurrentScrollOffset() const;
 
   gfx::ScrollOffset MaxScrollOffset() const;
   gfx::ScrollOffset ClampScrollOffsetToLimits(gfx::ScrollOffset offset) const;
   gfx::Vector2dF ClampScrollToMaxScrollOffset();
 
+  void SetScrollBoundaryBehavior(ScrollBoundaryBehavior);

[bokan, 2017/05/19 19:35:57]

pass by const-ref

[sunyunjia, 2017/05/25 20:07:10]

Done.

+  ScrollBoundaryBehavior scroll_boundary_behavior() {
+    return scroll_boundary_behavior_;
+  }
+
   // Returns the delta of the scroll that was outside of the bounds of the
   // initial scroll
   gfx::Vector2dF ScrollBy(const gfx::Vector2dF& scroll);
 
   void SetScrollClipLayer(int scroll_clip_layer_id);
   int scroll_clip_layer_id() const { return scroll_clip_layer_id_; }
   LayerImpl* scroll_clip_layer() const;
   bool scrollable() const;
 
   void set_user_scrollable_horizontal(bool scrollable);
@@ skipping 262 matching lines @@
   bool has_will_change_transform_hint_ : 1;
   bool needs_push_properties_ : 1;
   bool scrollbars_hidden_ : 1;
 
   // The needs_show_scrollbars_ bit tracks a pending request from Blink to show
   // the overlay scrollbars. It's set on the scroll layer (not the scrollbar
   // layers) and consumed by LayerTreeImpl::PushPropertiesTo during activation.
   bool needs_show_scrollbars_ : 1;
 
   bool raster_even_if_not_in_rsll_ : 1;
+  ScrollBoundaryBehavior scroll_boundary_behavior_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_