Add loadend event when finishing loading image

third_party/WebKit/Source/core/loader/ImageLoader.cpp

Index: third_party/WebKit/Source/core/loader/ImageLoader.cpp
diff --git a/third_party/WebKit/Source/core/loader/ImageLoader.cpp b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
index 86f65618292a28c53500d98bb06686c25897ba40..994069b1c57c042f1571d49393bad2062263d0b1 100644
--- a/third_party/WebKit/Source/core/loader/ImageLoader.cpp
+++ b/third_party/WebKit/Source/core/loader/ImageLoader.cpp
@@ -297,6 +297,7 @@ void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, Up
         if (!newImage && !pageIsBeingDismissed(&document)) {
             crossSiteOrCSPViolationOccurred(imageSourceURL);
             dispatchErrorEvent();
+            dispatchLoadendEventSoon();
         } else {
             clearFailedLoadURL();
         }
@@ -304,6 +305,7 @@ void ImageLoader::doUpdateFromElement(BypassMainWorldBehavior bypassBehavior, Up
         if (!imageSourceURL.isNull()) {
             // Fire an error event if the url string is not empty, but the KURL is.
             dispatchErrorEvent();
+            dispatchLoadendEventSoon();
         }
         noImageResourceToLoad();
     }
@@ -547,12 +549,13 @@ void ImageLoader::timerFired(TimerBase*)
 void ImageLoader::dispatchPendingEvent(ImageEventSender* eventSender)
 {
     RESOURCE_LOADING_DVLOG(1) << "ImageLoader::dispatchPendingEvent " << this;
-    ASSERT(eventSender == &loadEventSender() || eventSender == &errorEventSender());
     const AtomicString& eventType = eventSender->eventType();
     if (eventType == EventTypeNames::load)
         dispatchPendingLoadEvent();
     if (eventType == EventTypeNames::error)
         dispatchPendingErrorEvent();
+    if (eventType == EventTypeNames::loadend)
+        dispatchPendingLoadendEvent();
 }
 
 void ImageLoader::dispatchPendingLoadEvent()
@@ -584,6 +587,15 @@ void ImageLoader::dispatchPendingErrorEvent()
     updatedHasPendingEvent();
 }
 
+void ImageLoader::dispatchPendingLoadendEvent()
+{
+    if (element()->document().frame()) {
+        dispatchLoadendEvent();
+    }
+
+    updatedHasPendingEvent();
+}
+
 bool ImageLoader::getImageAnimationPolicy(ImageAnimationPolicy& policy)
 {
     if (!element()->document().settings())