Move flash clipboard to the new proxy and add custom format support

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 e6b527f63bf9fc2fa37f235207af8bc237d8c651..398ac81bdf6a5a2c640fa09fe152e0c484b8e90a 100644
--- a/ui/base/clipboard/clipboard_util_win.cc
+++ b/ui/base/clipboard/clipboard_util_win.cc
@@ -218,6 +218,12 @@ FORMATETC* ClipboardUtil::GetWebCustomDataFormat() {
   return &format;
 }
 
+FORMATETC* ClipboardUtil::GetPepperCustomDataFormat() {
+  static UINT cf =
+      RegisterClipboardFormat(L"Chromium Pepper MIME Data Format");
+  static FORMATETC format = {cf, 0, DVASPECT_CONTENT, -1, TYMED_HGLOBAL};
+  return &format;
+}
 
 bool ClipboardUtil::HasUrl(IDataObject* data_object) {
   DCHECK(data_object);