Align HTMLImageElement relevant mutations to spec

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

Index: third_party/WebKit/Source/core/html/HTMLPictureElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLPictureElement.cpp b/third_party/WebKit/Source/core/html/HTMLPictureElement.cpp
index f71379d9380dfb70f566c90e38b603870d037655..96fa451878770a4c6d00f32638eb8557b1619097 100644
--- a/third_party/WebKit/Source/core/html/HTMLPictureElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLPictureElement.cpp
@@ -9,6 +9,7 @@
 #include "core/dom/ElementTraversal.h"
 #include "core/frame/UseCounter.h"
 #include "core/html/HTMLImageElement.h"
+#include "core/html/HTMLSourceElement.h"
 #include "core/loader/ImageLoader.h"
 
 namespace blink {
@@ -22,10 +23,14 @@ inline HTMLPictureElement::HTMLPictureElement(Document& document)
 
 DEFINE_NODE_FACTORY(HTMLPictureElement)
 
-void HTMLPictureElement::sourceOrMediaChanged()
+void HTMLPictureElement::sourceOrMediaChanged(HTMLElement* sourceElement, Node* next)
 {
-    for (HTMLImageElement* imageElement = Traversal<HTMLImageElement>::firstChild(*this); imageElement; imageElement = Traversal<HTMLImageElement>::nextSibling(*imageElement)) {
-        imageElement->selectSourceURL(ImageLoader::UpdateNormal);
+    bool seenSource = false;
+    for (HTMLElement* element = Traversal<HTMLElement>::firstChild(*this); element; element = Traversal<HTMLElement>::nextSibling(*element)) {
+        if (sourceElement == element || (next && element == next))
+            seenSource = true;
+        if (isHTMLImageElement(element) && seenSource)
+            toHTMLImageElement(element)->selectSourceURL(ImageLoader::UpdateNormal);
     }
 }