IntersectionObserver: Always send an initial notification.

third_party/WebKit/Source/core/dom/IntersectionObserver.cpp

Index: third_party/WebKit/Source/core/dom/IntersectionObserver.cpp
diff --git a/third_party/WebKit/Source/core/dom/IntersectionObserver.cpp b/third_party/WebKit/Source/core/dom/IntersectionObserver.cpp
index 408fc2c21c8c4fa315a352cb12f394a5fbf0b496..779e0a33ee2e35c852bc3c5e199561fbdf7750b4 100644
--- a/third_party/WebKit/Source/core/dom/IntersectionObserver.cpp
+++ b/third_party/WebKit/Source/core/dom/IntersectionObserver.cpp
@@ -173,8 +173,7 @@ IntersectionObserver::IntersectionObserver(
       m_rightMargin(Fixed),
       m_bottomMargin(Fixed),
       m_leftMargin(Fixed),
-      m_rootIsImplicit(root ? 0 : 1),
-      m_initialState(InitialState::kHidden) {
+      m_rootIsImplicit(root ? 0 : 1) {
   switch (rootMargin.size()) {
     case 0:
       break;
@@ -272,11 +271,6 @@ void IntersectionObserver::observe(Element* target,
                                "element is not a descendant of root."));
   }
 
-  if (m_initialState == InitialState::kAuto) {
-    for (auto& observation : m_observations)
-      observation->setLastThresholdIndex(std::numeric_limits<unsigned>::max());
-  }
-
   if (FrameView* frameView = targetFrame->view())
     frameView->scheduleAnimation();
 }
@@ -314,11 +308,6 @@ void IntersectionObserver::disconnect(ExceptionState& exceptionState) {
   m_observations.clear();
 }
 
-void IntersectionObserver::setInitialState(InitialState initialState) {
-  DCHECK(m_observations.isEmpty());
-  m_initialState = initialState;
-}
-
 HeapVector<Member<IntersectionObserverEntry>> IntersectionObserver::takeRecords(
     ExceptionState& exceptionState) {
   HeapVector<Member<IntersectionObserverEntry>> entries;