First Implementation of Snapped Points

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp

Index: third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
index bea0b2b92a1e6ba000bf830e3065c3c771a8d571..eeffeec999f8dae0a79fab93efde3cd30784bcf5 100644
--- a/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/CompositedLayerMapping.cpp
@@ -52,6 +52,7 @@
 #include "core/page/ChromeClient.h"
 #include "core/page/Page.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
+#include "core/page/scrolling/SnapCoordinator.h"
 #include "core/page/scrolling/StickyPositionScrollingConstraints.h"
 #include "core/page/scrolling/TopDocumentRootScrollerController.h"
 #include "core/paint/FramePaintTiming.h"
@@ -1163,10 +1164,24 @@ void CompositedLayerMapping::UpdateGraphicsLayerGeometry(
   UpdateChildrenTransform();
   UpdateScrollParent(ScrollParent());
   RegisterScrollingLayers();
+  UpdateSnapOffsets();
 
   UpdateCompositingReasons();
 }
 
+void CompositedLayerMapping::UpdateSnapOffsets() {
+  SnapCoordinator* snapCoordinator =
+      GetLayoutObject().GetDocument().GetSnapCoordinator();
+  /*Vector<double> horizontal = snapCoordinator->SnapOffsets(
+      *ToContainerNode(GetLayoutObject().GetNode()), kHorizontalScrollbar);
+  Vector<double> vertical = snapCoordinator->SnapOffsets(
+      *ToContainerNode(GetLayoutObject().GetNode()), kVerticalScrollbar);*/
+  WebSnapPointList offsets = snapCoordinator->SnapOffsets(
+      *ToContainerNode(GetLayoutObject().GetNode()));
+  if (scrolling_contents_layer_)
+    scrolling_contents_layer_->SetSnapOffsets(offsets);
+}
+
 void CompositedLayerMapping::UpdateMainGraphicsLayerGeometry(
     const IntRect& relative_compositing_bounds,
     const IntRect& local_compositing_bounds,
@@ -1774,7 +1789,7 @@ void CompositedLayerMapping::UpdateDrawsContent() {
 
   if (scrolling_layer_) {
     // m_scrollingLayer never has backing store.
-    // m_scrollingContentsLayer only needs backing store if the scrolled
+    // scrolling_contents_layer_ only needs backing store if the scrolled
     // contents need to paint.
     scrolling_contents_are_empty_ =
         !owning_layer_.HasVisibleContent() ||
@@ -2282,7 +2297,7 @@ void CompositedLayerMapping::UpdateElementIdAndCompositorMutableProperties() {
   graphics_layer_->SetElementId(element_id);
   graphics_layer_->SetCompositorMutableProperties(primary_mutable_properties);
 
-  // We always set the elementId for m_scrollingContentsLayer since it can be
+  // We always set the elementId for scrolling_contents_layer_ since it can be
   // animated for smooth scrolling, so we don't need to set it conditionally
   // here.
   if (scrolling_contents_layer_.get())