MacViews: Implement FormatType::operator< on Mac.

ui/base/clipboard/clipboard_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/clipboard/clipboard_mac.h"
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
@@ skipping 71 matching lines @@
 std::string Clipboard::FormatType::Serialize() const {
   return base::SysNSStringToUTF8(data_);
 }
 
 // static
 Clipboard::FormatType Clipboard::FormatType::Deserialize(
     const std::string& serialization) {
   return FormatType(base::SysUTF8ToNSString(serialization));
 }
 
+#if defined(TOOLKIT_VIEWS)
+bool Clipboard::FormatType::operator<(const FormatType& other) const {
+  return [data_ compare:other.data_] == NSOrderedAscending;
+}
+#endif
+
 // Various predefined FormatTypes.
 // static
 Clipboard::FormatType Clipboard::GetFormatType(
     const std::string& format_string) {
   return FormatType::Deserialize(format_string);
 }
 
 // static
 const Clipboard::FormatType& Clipboard::GetUrlFormatType() {
   CR_DEFINE_STATIC_LOCAL(FormatType, type, (NSURLPboardType));
@@ skipping 342 matching lines @@
 // Write an extra flavor that signifies WebKit was the last to modify the
 // pasteboard. This flavor has no data.
 void ClipboardMac::WriteWebSmartPaste() {
   NSPasteboard* pb = GetPasteboard();
   NSString* format = GetWebKitSmartPasteFormatType().ToNSString();
   [pb addTypes:[NSArray arrayWithObject:format] owner:nil];
   [pb setData:nil forType:format];
 }
 
 }  // namespace ui