Use Shadow DOM to display fallback content for images

Source/core/html/HTMLInputElement.cpp

Index: Source/core/html/HTMLInputElement.cpp
diff --git a/Source/core/html/HTMLInputElement.cpp b/Source/core/html/HTMLInputElement.cpp
index 253c04bd2f005c3d7b92a0c8d353b10a9c39e963..c270fa9af396e23a1c3521b0e7a171974cc005f1 100644
--- a/Source/core/html/HTMLInputElement.cpp
+++ b/Source/core/html/HTMLInputElement.cpp
@@ -126,9 +126,7 @@ HTMLInputElement::HTMLInputElement(Document& document, HTMLFormElement* form, bo
     , m_inputType(InputType::createText(*this))
     , m_inputTypeView(m_inputType)
 {
-#if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
     setHasCustomStyleCallbacks();
-#endif
     ScriptWrappable::init(this);
 }
 
@@ -1878,12 +1876,10 @@ bool HTMLInputElement::supportsAutofocus() const
     return m_inputType->isInteractiveContent();
 }
 
-#if ENABLE(INPUT_MULTIPLE_FIELDS_UI)
 PassRefPtr<RenderStyle> HTMLInputElement::customStyleForRenderer()
 {
     return m_inputTypeView->customStyleForRenderer(originalStyleForRenderer());
 }
-#endif
 
 bool HTMLInputElement::shouldDispatchFormControlChangeEvent(String& oldValue, String& newValue)
 {
@@ -1900,4 +1896,14 @@ AXObject* HTMLInputElement::popupRootAXObject()
     return m_inputTypeView->popupRootAXObject();
 }
 
+void HTMLInputElement::ensureFallbackContent()
+{
+    m_inputTypeView->ensureFallbackContent();
+}
+
+void HTMLInputElement::ensurePrimaryContent()
+{
+    m_inputTypeView->ensurePrimaryContent();
+}
+
 } // namespace