Ensure RemoteViewportIntersection rect persists across frame navigations

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 3eefa4fb1b4e989b32a932a7221951863416ce44..7cafbe02ce0e9dfedff7e7523c0dea7409fc8e7e 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -1201,4 +1201,13 @@ WebPluginContainerBase* LocalFrame::GetWebPluginContainerBase(
   return nullptr;
 }
 
+void LocalFrame::SetViewportIntersectionFromParent(
+    const IntRect& viewport_intersection) {
+  if (remote_viewport_intersection_ != viewport_intersection) {
+    remote_viewport_intersection_ = viewport_intersection;
+    if (View())
+      View()->ScheduleAnimation();
+  }
+}
+
 }  // namespace blink