Translate the overscroll elasticity layer by the overscroll amount

cc/trees/layer_tree_host_common.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_TREES_LAYER_TREE_HOST_COMMON_H_
 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
 
 #include <limits>
 #include <vector>
 
@@ skipping 20 matching lines @@
 
   template <typename LayerType, typename RenderSurfaceLayerListType>
   struct CalcDrawPropsInputs {
    public:
     CalcDrawPropsInputs(LayerType* root_layer,
                         const gfx::Size& device_viewport_size,
                         const gfx::Transform& device_transform,
                         float device_scale_factor,
                         float page_scale_factor,
                         const LayerType* page_scale_application_layer,
+                        const gfx::Vector2dF& elastic_overscroll,
+                        const LayerType* elastic_overscroll_application_layer,
                         int max_texture_size,
                         bool can_use_lcd_text,
                         bool layers_always_allowed_lcd_text,
                         bool can_render_to_separate_surface,
                         bool can_adjust_raster_scales,
                         RenderSurfaceLayerListType* render_surface_layer_list,
                         int current_render_surface_layer_list_id)
         : root_layer(root_layer),
           device_viewport_size(device_viewport_size),
           device_transform(device_transform),
           device_scale_factor(device_scale_factor),
           page_scale_factor(page_scale_factor),
           page_scale_application_layer(page_scale_application_layer),
+          elastic_overscroll(elastic_overscroll),
+          elastic_overscroll_application_layer(
+              elastic_overscroll_application_layer),
           max_texture_size(max_texture_size),
           can_use_lcd_text(can_use_lcd_text),
           layers_always_allowed_lcd_text(layers_always_allowed_lcd_text),
           can_render_to_separate_surface(can_render_to_separate_surface),
           can_adjust_raster_scales(can_adjust_raster_scales),
           render_surface_layer_list(render_surface_layer_list),
           current_render_surface_layer_list_id(
               current_render_surface_layer_list_id) {}
 
     LayerType* root_layer;
     gfx::Size device_viewport_size;
     const gfx::Transform& device_transform;
     float device_scale_factor;
     float page_scale_factor;
     const LayerType* page_scale_application_layer;
+    gfx::Vector2dF elastic_overscroll;
+    const LayerType* elastic_overscroll_application_layer;
     int max_texture_size;
     bool can_use_lcd_text;
     bool layers_always_allowed_lcd_text;
     bool can_render_to_separate_surface;
     bool can_adjust_raster_scales;
     RenderSurfaceLayerListType* render_surface_layer_list;
     int current_render_surface_layer_list_id;
   };
 
   template <typename LayerType, typename RenderSurfaceLayerListType>
@@ skipping 59 matching lines @@
     gfx::Vector2d scroll_delta;
   };
 };
 
 struct CC_EXPORT ScrollAndScaleSet {
   ScrollAndScaleSet();
   ~ScrollAndScaleSet();
 
   std::vector<LayerTreeHostCommon::ScrollUpdateInfo> scrolls;
   float page_scale_delta;
+  gfx::Vector2dF elastic_overscroll_delta;
   float top_controls_delta;
   ScopedPtrVector<SwapPromise> swap_promises;
 };
 
 template <typename LayerType>
 bool LayerTreeHostCommon::RenderSurfaceContributesToTarget(
     LayerType* layer,
     int target_surface_layer_id) {
   // A layer will either contribute its own content, or its render surface's
   // content, to the target surface. The layer contributes its surface's content
@@ skipping 58 matching lines @@
         const gfx::Size& device_viewport_size,
         const gfx::Transform& device_transform,
         RenderSurfaceLayerListType* render_surface_layer_list)
     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
           root_layer,
           device_viewport_size,
           device_transform,
           1.f,
           1.f,
           NULL,
+          gfx::Vector2dF(),
+          NULL,
           std::numeric_limits<int>::max() / 2,
           false,
           false,
           true,
           false,
           render_surface_layer_list,
           0) {
   DCHECK(root_layer);
   DCHECK(render_surface_layer_list);
 }
 
 template <typename LayerType, typename RenderSurfaceLayerListType>
 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
                                                    RenderSurfaceLayerListType>::
     CalcDrawPropsInputsForTesting(
         LayerType* root_layer,
         const gfx::Size& device_viewport_size,
         RenderSurfaceLayerListType* render_surface_layer_list)
     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
           root_layer,
           device_viewport_size,
           identity_transform_,
           1.f,
           1.f,
           NULL,
+          gfx::Vector2dF(),
+          NULL,
           std::numeric_limits<int>::max() / 2,
           false,
           false,
           true,
           false,
           render_surface_layer_list,
           0) {
   DCHECK(root_layer);
   DCHECK(render_surface_layer_list);
 }
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_