[POC] copying video frame

Source/core/editing/Editor.cpp

Index: Source/core/editing/Editor.cpp
diff --git a/Source/core/editing/Editor.cpp b/Source/core/editing/Editor.cpp
index 4f4ec160fb6318e2341d6162f0d024f826598bb8..5377afef5d258f07fa915d18c47da1473f322623 100644
--- a/Source/core/editing/Editor.cpp
+++ b/Source/core/editing/Editor.cpp
@@ -72,6 +72,7 @@
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLTextAreaElement.h"
+#include "core/html/HTMLVideoElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/loader/EmptyClients.h"
 #include "core/page/EditorClient.h"
@@ -442,6 +443,11 @@ static Image* imageFromNode(const Node& node)
         return cachedImage->imageForRenderer(renderImage);
     }
 
+    if (renderer->isMedia()) {
+        SourceImageStatus status;
+        return toHTMLVideoElement(node).getSourceImageForCanvas(CopySourceImageIfVolatile, &status).leakRef();
+    }
+
     return nullptr;
 }