Add pixel readback to page popup

Source/web/WebPagePopupImpl.cpp

Index: Source/web/WebPagePopupImpl.cpp
diff --git a/Source/web/WebPagePopupImpl.cpp b/Source/web/WebPagePopupImpl.cpp
index a199ba4258e31045086305614abb9208082cd6cc..74673d051453d7646f91c2668a5405652681d82a 100644
--- a/Source/web/WebPagePopupImpl.cpp
+++ b/Source/web/WebPagePopupImpl.cpp
@@ -44,6 +44,7 @@
 #include "core/page/Page.h"
 #include "core/page/PagePopupClient.h"
 #include "platform/TraceEvent.h"
+#include "public/platform/WebCompositeAndReadbackAsyncCallback.h"
 #include "public/platform/WebCursorInfo.h"
 #include "public/web/WebAXObject.h"
 #include "public/web/WebFrameClient.h"
@@ -424,6 +425,17 @@ void WebPagePopupImpl::closePopup()
     m_popupClient->didClosePopup();
 }
 
+void WebPagePopupImpl::compositeAndReadbackAsync(WebCompositeAndReadbackAsyncCallback* callback)
+{
+    ASSERT(isAcceleratedCompositingActive());
+    m_layerTreeView->compositeAndReadbackAsync(callback);
+}
+
+WebPoint WebPagePopupImpl::screenPosition()
+{
+    return WebPoint(m_windowRectInScreen.x, m_windowRectInScreen.y);
+}
+
 // WebPagePopup ----------------------------------------------------------------
 
 WebPagePopup* WebPagePopup::create(WebWidgetClient* client)