Add pixel readback to page popup

Source/core/testing/Internals.cpp

Index: Source/core/testing/Internals.cpp
diff --git a/Source/core/testing/Internals.cpp b/Source/core/testing/Internals.cpp
index 5ff5ec2095a3e0d4142be4b56259878f7939e096..210248d31cd52514ad5912bec6998e22bc9c0ccc 100644
--- a/Source/core/testing/Internals.cpp
+++ b/Source/core/testing/Internals.cpp
@@ -669,6 +669,20 @@ PassRefPtrWillBeRawPtr<PagePopupController> Internals::pagePopupController()
     return s_pagePopupDriver ? s_pagePopupDriver->pagePopupController() : 0;
 }
 
+LocalDOMWindow* Internals::pagePopupWindow() const
+{
+    Document* document = contextDocument();
+    if (!document)
+        return nullptr;
+    Page* page = document->page();
+    if (!page)
+        return nullptr;
+    PagePopupDriver* pagePopupDriver = page->chrome().client().pagePopupDriver();
+    if (!pagePopupDriver)
+        return nullptr;
+    return pagePopupDriver->pagePopupWindow();
+}
+
 PassRefPtrWillBeRawPtr<ClientRect> Internals::absoluteCaretBounds(ExceptionState& exceptionState)
 {
     Document* document = contextDocument();