Implement Clipboard::ReadData and Clipboard::WriteData for Mac.

ui/base/clipboard/clipboard.h

Index: ui/base/clipboard/clipboard.h
diff --git a/ui/base/clipboard/clipboard.h b/ui/base/clipboard/clipboard.h
index a3e9181088e2a221c0bc731af5c1e7ea65151897..e73fc8f618af1a3e49296d062b09e3b80b49af1e 100644
--- a/ui/base/clipboard/clipboard.h
+++ b/ui/base/clipboard/clipboard.h
@@ -172,7 +172,7 @@ class UI_EXPORT Clipboard {
   // as a byte vector.
   // TODO(dcheng): Due to platform limitations on Windows, we should make sure
   // format is never controlled by the user.
-  void ReadData(const std::string& format, std::string* result);
+  void ReadData(const std::string& format, std::string* result) const;
 
   // Get format Identifiers for various types.
   static FormatType GetUrlFormatType();
@@ -225,12 +225,10 @@ class UI_EXPORT Clipboard {
 
   void WriteBitmap(const char* pixel_data, const char* size_data);
 
-#if !defined(OS_MACOSX)
   // |format_name| is an ASCII string and should be NULL-terminated.
   // TODO(estade): port to mac.

[tony, 2011/12/05 18:56:09]

Nit: Get rid of the TODO.

[dcheng, 2011/12/05 19:53:03]

Done.

   void WriteData(const char* format_name, size_t format_len,
                  const char* data_data, size_t data_len);
-#endif
 #if defined(OS_WIN)
   void WriteBitmapFromHandle(HBITMAP source_hbitmap,
                              const gfx::Size& size);