Translate the overscroll elasticity layer by the overscroll amount

cc/trees/layer_tree_host_common.cc

Index: cc/trees/layer_tree_host_common.cc
diff --git a/cc/trees/layer_tree_host_common.cc b/cc/trees/layer_tree_host_common.cc
index 6d75687201a55b640db73bb1d10ac125bdf63c5a..5ed64246afea0e9cec12124967b383cc88d55914 100644
--- a/cc/trees/layer_tree_host_common.cc
+++ b/cc/trees/layer_tree_host_common.cc
@@ -1267,6 +1267,8 @@ struct SubtreeGlobals {
   float device_scale_factor;
   float page_scale_factor;
   const LayerType* page_scale_application_layer;
+  gfx::Vector2dF elastic_overscroll;
+  const LayerType* elastic_overscroll_application_layer;
   bool can_adjust_raster_scales;
   bool can_render_to_separate_surface;
   bool layers_always_allowed_lcd_text;
@@ -2100,6 +2102,10 @@ static void CalculateDrawPropertiesInternal(
           globals.page_scale_factor);
       data_for_children.in_subtree_of_page_scale_application_layer = true;
     }
+    if (layer == globals.elastic_overscroll_application_layer) {
+      data_for_children.parent_matrix.Translate(globals.elastic_overscroll.x(),
+                                                globals.elastic_overscroll.y());
+    }
 
     // Flatten to 2D if the layer doesn't preserve 3D.
     if (layer->should_flatten_transform())
@@ -2378,6 +2384,9 @@ static void ProcessCalcDrawPropsInputs(
       inputs.device_scale_factor * device_transform_scale;
   globals->page_scale_factor = inputs.page_scale_factor;
   globals->page_scale_application_layer = inputs.page_scale_application_layer;
+  globals->elastic_overscroll = inputs.elastic_overscroll;
+  globals->elastic_overscroll_application_layer =
+      inputs.elastic_overscroll_application_layer;
   globals->can_render_to_separate_surface =
       inputs.can_render_to_separate_surface;
   globals->can_adjust_raster_scales = inputs.can_adjust_raster_scales;