Enable custom MIME types in web copy/paste.

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 cb61441570909fc4513e77c819d044f38597aaba..9b6479118c4e59d4300e0aa6805d5e042cdbcfb7 100644
--- a/ui/base/clipboard/clipboard_gtk.cc
+++ b/ui/base/clipboard/clipboard_gtk.cc
@@ -17,6 +17,7 @@
 #include "base/memory/singleton.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/clipboard/custom_data_helper.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/x/x11_util.h"
 #include "ui/gfx/canvas_skia.h"
@@ -106,6 +107,8 @@ GdkFilterReturn SelectionChangeObserver::OnXEvent(GdkXEvent* xevent,
 const char kMimeTypeBitmap[] = "image/bmp";
 const char kMimeTypeMozillaURL[] = "text/x-moz-url";
 const char kMimeTypeWebkitSmartPaste[] = "chromium/x-webkit-paste";
+// TODO(dcheng): This name is temporary. See crbug.com/106449
+const char kMimeTypeWebCustomData[] = "chromium/x-web-custom-data";
 
 std::string GdkAtomToString(const GdkAtom& atom) {
   gchar* name = gdk_atom_name(atom);
@@ -390,6 +393,17 @@ void Clipboard::ReadAvailableTypes(Clipboard::Buffer buffer,
   if (IsFormatAvailable(GetBitmapFormatType(), buffer))
     types->push_back(UTF8ToUTF16(kMimeTypePNG));
   *contains_filenames = false;
+
+  GtkClipboard* clipboard = LookupBackingClipboard(buffer);
+  if (!clipboard)
+    return;
+
+  GtkSelectionData* data = gtk_clipboard_wait_for_contents(
+      clipboard, StringToGdkAtom(GetWebCustomDataFormatType()));
+  if (!data)
+    return;
+  ReadCustomDataTypes(data->data, data->length, types);
+  gtk_selection_data_free(data);
 }
 
 
@@ -491,8 +505,16 @@ SkBitmap Clipboard::ReadImage(Buffer buffer) const {
 void Clipboard::ReadCustomData(Buffer buffer,
                                const string16& type,
                                string16* result) const {
-  // TODO(dcheng): Implement this.
-  NOTIMPLEMENTED();
+  GtkClipboard* clipboard = LookupBackingClipboard(buffer);
+  if (!clipboard)
+    return;
+
+  GtkSelectionData* data = gtk_clipboard_wait_for_contents(
+      clipboard, StringToGdkAtom(GetWebCustomDataFormatType()));
+  if (!data)
+    return;
+  ReadCustomDataForType(data->data, data->length, type, result);
+  gtk_selection_data_free(data);
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {
@@ -541,6 +563,11 @@ Clipboard::FormatType Clipboard::GetWebKitSmartPasteFormatType() {
   return std::string(kMimeTypeWebkitSmartPaste);
 }
 
+// static
+Clipboard::FormatType Clipboard::GetWebCustomDataFormatType() {
+  return std::string(kMimeTypeWebCustomData);
+}
+
 void Clipboard::InsertMapping(const char* key,
                               char* data,
                               size_t data_len) {