Clear the clipboard closing Incognito window

ui/base/clipboard/clipboard_gtk.cc

Index: ui/base/clipboard/clipboard_gtk.cc
diff --git a/ui/base/clipboard/clipboard_gtk.cc b/ui/base/clipboard/clipboard_gtk.cc
index 7473f31097289eb0b7bc716711c256392a2fd88f..1f705907b83f595120dc5e83e704a616186b85be 100644
--- a/ui/base/clipboard/clipboard_gtk.cc
+++ b/ui/base/clipboard/clipboard_gtk.cc
@@ -106,6 +106,7 @@ GdkFilterReturn SelectionChangeObserver::OnXEvent(GdkXEvent* xevent,
   return GDK_FILTER_CONTINUE;
 }
 
+const char kSourceTagType[] = "org.chromium.source-tag";
 const char kMimeTypeBitmap[] = "image/bmp";
 const char kMimeTypeMozillaURL[] = "text/x-moz-url";
 const char kMimeTypePepperCustomData[] = "chromium/x-pepper-custom-data";
@@ -217,7 +218,9 @@ Clipboard::~Clipboard() {
   gtk_clipboard_store(clipboard_);
 }
 
-void Clipboard::WriteObjects(Buffer buffer, const ObjectMap& objects) {
+void Clipboard::WriteObjectsImpl(Buffer buffer,
+                                 const ObjectMap& objects,
+                                 SourceTag tag) {
   DCHECK(CalledOnValidThread());
   clipboard_data_ = new TargetMap();
 
@@ -225,6 +228,7 @@ void Clipboard::WriteObjects(Buffer buffer, const ObjectMap& objects) {
        iter != objects.end(); ++iter) {
     DispatchObject(static_cast<ObjectType>(iter->first), iter->second);
   }
+  WriteSourceTag(tag);
 
   SetGtkClipboard(buffer);
 }
@@ -350,6 +354,13 @@ void Clipboard::WriteData(const FormatType& format,
   InsertMapping(GdkAtomToString(format.ToGdkAtom()).c_str(), data, data_len);
 }
 
+void Clipboard::WriteSourceTag(SourceTag tag) {
+  if (tag != SourceTag()) {
+    ObjectMapParam binary = SourceTag2Binary(tag);
+    WriteData(GetSourceTagFormatType(), &binary[0], binary.size());
+  }
+}
+
 // We do not use gtk_clipboard_wait_is_target_available because of
 // a bug with the gtk clipboard. It caches the available targets
 // and does not always refresh the cache when it is appropriate.
@@ -587,6 +598,12 @@ void Clipboard::ReadData(const FormatType& format, std::string* result) const {
   gtk_selection_data_free(data);
 }
 
+Clipboard::SourceTag Clipboard::ReadSourceTag() const {
+  std::string result;
+  ReadData(GetSourceTagFormatType(), &result);
+  return Binary2SourceTag(result);
+}
+
 uint64 Clipboard::GetSequenceNumber(Buffer buffer) {
   DCHECK(CalledOnValidThread());
   if (buffer == BUFFER_STANDARD)
@@ -659,6 +676,12 @@ const Clipboard::FormatType& Clipboard::GetPepperCustomDataFormatType() {
   return type;
 }
 
+// static
+const Clipboard::FormatType& Clipboard::GetSourceTagFormatType() {
+  CR_DEFINE_STATIC_LOCAL(FormatType, type, (kSourceTagType));
+  return type;
+}
+
 void Clipboard::InsertMapping(const char* key,
                               char* data,
                               size_t data_len) {