Add loadend event when finishing loading image

third_party/WebKit/Source/core/html/HTMLImageLoader.cpp

Index: third_party/WebKit/Source/core/html/HTMLImageLoader.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLImageLoader.cpp b/third_party/WebKit/Source/core/html/HTMLImageLoader.cpp
index fdaa2f14c09f07a3625b72fbabb0379c84565fc1..ad61807a7ba76f79f6a9995ce113c608c1588974 100644
--- a/third_party/WebKit/Source/core/html/HTMLImageLoader.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLImageLoader.cpp
@@ -24,6 +24,7 @@
 #include "core/HTMLNames.h"
 #include "core/dom/Element.h"
 #include "core/events/Event.h"
+#include "core/events/EventSender.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourceLoadingLog.h"
 #include "core/html/HTMLImageElement.h"
@@ -35,6 +36,17 @@ namespace blink {
 
 using namespace HTMLNames;
 
+static ImageEventSender& loadendEventSender()
+{
+    DEFINE_STATIC_LOCAL(ImageEventSender, sender, (ImageEventSender::create(EventTypeNames::loadend)));
+    return sender;
+}
+
+void HTMLImageLoader::dispatchPendingLoadendEvents()
+{
+    loadendEventSender().dispatchPendingEvents();
+}
+
 HTMLImageLoader::HTMLImageLoader(Element* element)
     : ImageLoader(element)
 {
@@ -58,6 +70,22 @@ void HTMLImageLoader::dispatchLoadEvent()
     element()->dispatchEvent(Event::create(errorOccurred ? EventTypeNames::error : EventTypeNames::load));
 }
 
+void HTMLImageLoader::dispatchLoadendEvent()
+{
+    RESOURCE_LOADING_DVLOG(1) << "HTMLImageLoader::dispatchLoadendEvent " << this;
+
+    if (isHTMLImageElement(*element()))
+        element()->dispatchEvent(Event::create(EventTypeNames::loadend));
+}
+
+void HTMLImageLoader::dispatchLoadendEventSoon()
+{
+    RESOURCE_LOADING_DVLOG(1) << "HTMLImageLoader::dispatchLoadendEventSoon " << this;
+
+    if (isHTMLImageElement(*element()))
+        loadendEventSender().dispatchEventSoon(this);
+}
+
 static void loadFallbackContentForElement(Element* element)
 {
     if (isHTMLImageElement(element))
@@ -96,6 +124,7 @@ void HTMLImageLoader::imageNotifyFinished(ImageResource*)
 
     if ((loadError || cachedImage->response().httpStatusCode() >= 400) && isHTMLObjectElement(*element))
         toHTMLObjectElement(element)->renderFallbackContent();
+    dispatchLoadendEventSoon();
 }
 
 void HTMLImageLoader::ensureFallbackContent()