Enable custom MIME types in web copy/paste.

ui/base/clipboard/clipboard_mac.mm

Index: ui/base/clipboard/clipboard_mac.mm
diff --git a/ui/base/clipboard/clipboard_mac.mm b/ui/base/clipboard/clipboard_mac.mm
index ba9c74a5e5ec4c3bd55968e6c624715636287ce0..153f5e9225e0853c5b2876b7a58be18b94efc905 100644
--- a/ui/base/clipboard/clipboard_mac.mm
+++ b/ui/base/clipboard/clipboard_mac.mm
@@ -15,6 +15,7 @@
 #include "base/utf_string_conversions.h"
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 #include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/base/clipboard/custom_data_helper.h"
 #include "ui/gfx/canvas_skia.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 #include "ui/gfx/size.h"
@@ -30,6 +31,9 @@ NSString* const kUTTypeURLName = @"public.url-name";
 // actual data associated with this type.
 NSString* const kWebSmartPastePboardType = @"NeXT smart paste pasteboard type";
 
+// TODO(dcheng): This name is temporary. See crbug.com/106449.
+NSString* const kWebCustomDataType = @"org.chromium.web-custom-data";
+
 NSPasteboard* GetPasteboard() {
   // The pasteboard should not be nil in a UI session, but this handy DCHECK
   // can help track down problems if someone tries using clipboard code outside
@@ -156,9 +160,10 @@ void Clipboard::WriteBitmap(const char* pixel_data, const char* size_data) {
 void Clipboard::WriteData(const char* format_name, size_t format_len,
                           const char* data_data, size_t data_len) {
   NSPasteboard* pb = GetPasteboard();
-  NSString* format = [[NSString alloc] initWithBytes:format_name
-                                              length:format_len
-                                            encoding:NSUTF8StringEncoding];
+  scoped_nsobject<NSString> format(
+      [[NSString alloc] initWithBytes:format_name
+                               length:format_len
+                             encoding:NSUTF8StringEncoding]);
   [pb addTypes:[NSArray arrayWithObject:format] owner:nil];
   [pb setData:[NSData dataWithBytes:data_data length:data_len]
       forType:format];
@@ -224,6 +229,13 @@ void Clipboard::ReadAvailableTypes(Clipboard::Buffer buffer,
   if ([NSImage canInitWithPasteboard:GetPasteboard()])
     types->push_back(UTF8ToUTF16(kMimeTypePNG));
   *contains_filenames = false;
+
+  NSPasteboard* pb = GetPasteboard();
+  if ([[pb types] containsObject:kWebCustomDataType]) {
+    NSData* data = [pb dataForType:kWebCustomDataType];
+    if ([data length])
+      ReadCustomDataTypes([data bytes], [data length], types);
+  }
 }
 
 void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
@@ -309,8 +321,14 @@ SkBitmap Clipboard::ReadImage(Buffer buffer) const {
 void Clipboard::ReadCustomData(Buffer buffer,
                                const string16& type,
                                string16* result) const {
-  // TODO(dcheng): Implement this.
-  NOTIMPLEMENTED();
+  DCHECK_EQ(buffer, BUFFER_STANDARD);
+
+  NSPasteboard* pb = GetPasteboard();
+  if ([[pb types] containsObject:kWebCustomDataType]) {
+    NSData* data = [pb dataForType:kWebCustomDataType];
+    if ([data length])
+      ReadCustomDataForType([data bytes], [data length], type, result);
+  }
 }
 
 void Clipboard::ReadBookmark(string16* title, std::string* url) const {
@@ -416,4 +434,9 @@ Clipboard::FormatType Clipboard::GetWebKitSmartPasteFormatType() {
   return base::SysNSStringToUTF8(kWebSmartPastePboardType);
 }
 
+// static
+Clipboard::FormatType Clipboard::GetWebCustomDataFormatType() {
+  return base::SysNSStringToUTF8(kWebCustomDataType);
+}
+
 }  // namespace ui