First Implementation of Snapped Points

cc/blink/web_layer_impl.cc

Index: cc/blink/web_layer_impl.cc
diff --git a/cc/blink/web_layer_impl.cc b/cc/blink/web_layer_impl.cc
index 5526a70f430a682daf21468d400d99c8d8efd263..70dfa66898463f886a7fea92433a4d1fbb4e2d62 100644
--- a/cc/blink/web_layer_impl.cc
+++ b/cc/blink/web_layer_impl.cc
@@ -19,6 +19,7 @@
 #include "cc/blink/web_blend_mode.h"
 #include "cc/layers/layer.h"
 #include "cc/layers/layer_position_constraint.h"
+#include "cc/layers/snap_point_list.h"
 #include "cc/trees/element_id.h"
 #include "cc/trees/layer_tree_host.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
@@ -27,6 +28,7 @@
 #include "third_party/WebKit/public/platform/WebLayerScrollClient.h"
 #include "third_party/WebKit/public/platform/WebLayerStickyPositionConstraint.h"
 #include "third_party/WebKit/public/platform/WebSize.h"
+#include "third_party/WebKit/public/platform/WebSnapPointList.h"
 #include "third_party/skia/include/core/SkMatrix44.h"
 #include "ui/gfx/geometry/rect_conversions.h"
 #include "ui/gfx/geometry/vector2d_conversions.h"
@@ -411,6 +413,21 @@ static cc::LayerStickyPositionConstraint ToStickyPositionConstraint(
       web_constraint.nearest_layer_shifting_containing_block;
   return constraint;
 }
+static cc::SnapPointList ToSnapPointList(
+    const blink::WebSnapPointList& web_list) {
+  cc::SnapPointList list;
+  for (blink::WebSnapPoint point : web_list.HorizontalOffsets()) {
+    /*LOG(ERROR) << point.offset << " " << point.must_snap << " "
+      << point.is_start << " " << point.is_end;*/
+    list.horizontal.push_back(cc::SnapPoint(point.offset, point.must_snap,
+                                            point.is_start, point.is_end));
+  }
+  for (blink::WebSnapPoint point : web_list.VerticalOffsets()) {
+    list.vertical.push_back(cc::SnapPoint(point.offset, point.must_snap,
+                                          point.is_start, point.is_end));
+  }
+  return list;
+}
 void WebLayerImpl::SetStickyPositionConstraint(
     const blink::WebLayerStickyPositionConstraint& constraint) {
   layer_->SetStickyPositionConstraint(ToStickyPositionConstraint(constraint));
@@ -432,6 +449,11 @@ void WebLayerImpl::SetScrollClient(blink::WebLayerScrollClient* scroll_client) {
   }
 }
 
+void WebLayerImpl::SetScrollSnapOffsets(
+    const blink::WebSnapPointList& offsets) {
+  layer_->SetScrollSnapOffsets(ToSnapPointList(offsets));
+}
+
 void WebLayerImpl::SetLayerClient(cc::LayerClient* client) {
   layer_->SetLayerClient(client);
 }