Intersection Observer support for OOPIF

third_party/WebKit/Source/core/frame/FrameView.h

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index f3496595a49b91242f2929265d357eb26dab8317..c559b99d893c40d0861d889f1919891e8c02c8c5 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -31,6 +31,7 @@
 #include "core/frame/FrameViewAutoSizeInfo.h"
 #include "core/frame/LayoutSubtreeRootList.h"
 #include "core/frame/RootFrameViewport.h"
+#include "core/layout/MapCoordinatesFlags.h"
 #include "core/layout/ScrollAnchor.h"
 #include "core/paint/FirstMeaningfulPaintDetector.h"
 #include "core/paint/ObjectPaintProperties.h"
@@ -767,6 +768,18 @@ class CORE_EXPORT FrameView final
   // Only for SPv2.
   std::unique_ptr<JSONObject> compositedLayersAsJSON(LayerTreeFlags);
 
+  // Called on a view for a LocalFrame with a RemoteFrame parent. This makes
+  // viewport intersection available that accounts for remote ancestor frames
+  // and their respective scroll positions, clips, etc.
+  void setViewportIntersectionFromParent(const IntRect&);
+  IntRect remoteViewportIntersection();
+
+  void mapQuadToAncestorFrameIncludingScrollOffset(

[szager1, 2016/12/16 03:42:34]

Please put a comment here about why this is necessary (why localToAncestorQuad
isn't sufficient).

[kenrb, 2016/12/16 16:17:35]

Done.

+      LayoutRect&,
+      const LayoutObject* descendant,
+      const LayoutView* ancestor,
+      MapCoordinatesFlags mode);
+
  protected:
   // Scroll the content via the compositor.
   bool scrollContentsFastPath(const IntSize& scrollDelta);
@@ -1121,6 +1134,8 @@ class CORE_EXPORT FrameView final
 
   Member<ElementVisibilityObserver> m_visibilityObserver;
 
+  IntRect m_remoteViewportIntersection;
+
   // For testing.
   struct ObjectPaintInvalidation {
     String name;