Enable custom MIME types in web copy/paste.

ui/base/clipboard/clipboard_util_win.cc

Index: ui/base/clipboard/clipboard_util_win.cc
diff --git a/ui/base/clipboard/clipboard_util_win.cc b/ui/base/clipboard/clipboard_util_win.cc
index 11c1e3017ca5f2ea5f306f99078365a06fdaa06d..4fe3e42e89b91da9594195cfe2d807a5dc5d1993 100644
--- a/ui/base/clipboard/clipboard_util_win.cc
+++ b/ui/base/clipboard/clipboard_util_win.cc
@@ -203,6 +203,14 @@ FORMATETC* ClipboardUtil::GetWebKitSmartPasteFormat() {
   return &format;
 }
 
+FORMATETC* ClipboardUtil::GetWebCustomDataFormat() {
+  // TODO(dcheng): This name is temporary. See crbug.com/106449
+  static UINT cf =
+      RegisterClipboardFormat(L"Chromium Web Custom MIME Data Format");
+  static FORMATETC format = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
+  return &format;
+}
+
 
 bool ClipboardUtil::HasUrl(IDataObject* data_object) {
   DCHECK(data_object);