Add pixel readback to page popup

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index b6aab0add60f54b0b88bb0136d36d162ae698a04..1f6a3b5da7e9d0151478ef620280453375a7fd70 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -116,6 +116,7 @@
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/weborigin/SchemeRegistry.h"
 #include "public/platform/Platform.h"
+#include "public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "public/platform/WebDragData.h"
 #include "public/platform/WebFloatPoint.h"
 #include "public/platform/WebGestureCurve.h"
@@ -2492,6 +2493,11 @@ WebColor WebViewImpl::backgroundColor() const
     return view->documentBackgroundColor().rgb();
 }
 
+WebPagePopup* WebViewImpl::pagePopup() const
+{
+    return m_pagePopup.get();
+}
+
 bool WebViewImpl::caretOrSelectionRange(size_t* location, size_t* length)
 {
     const LocalFrame* focused = toLocalFrame(focusedCoreFrame());