Support the OS X find pasteboard on OS X.

chrome/browser/cocoa/find_pasteboard.h

+// Copyright (c) 2009 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.
+
+#ifndef CHROME_BROWSER_COCOA_FIND_PASTEBOARD_H_
+#define CHROME_BROWSER_COCOA_FIND_PASTEBOARD_H_
+
+#include "base/string16.h"
+
+#ifdef __OBJC__
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+
+extern NSString* kFindPasteboardChangedNotification;
+
+// Manages the find pasteboard. Use this to copy text to the find pasteboard,
+// to get the text currently on the find pasteboard, and to receive
+// notifications when the text on the find pasteboard has changed. You should
+// always use this class instead of accessing
+// [NSPasteboard pasteboardWithName:NSFindPboard] directly.
+//
+// This is not thread-safe and must be used on the main thread.
+//
+// This is supposed to be a singleton.
+@interface FindPasteboard : NSObject {
+ @private
+  scoped_nsobject<NSString> findText_;
+}
+
+// Returns the singleton instance of this class.
++ (FindPasteboard*)sharedInstance;
+
+// Returns the current find text. This is never nil; if there is no text on the
+// find pasteboard, this returns an empty string.
+- (NSString*)findText;
+
+// Sets the current find text to |newText| and sends a
+// |kFindPasteboardChangedNotification| to the default notification center if
+// it the new text different from the current text. |newText| must not be nil.
+- (void)setFindText:(NSString*)newText;
+@end
+
+@interface FindPasteboard (TestingAPI)
+- (void)loadTextFromPasteboard:(NSNotification*)notification;
+
+// This methods is meant to be overridden in tests.
+- (NSPasteboard*)findPboard;
+@end
+
+#endif  // __OBJC__
+
+// Also provide a c++ interface
+string16 GetFindPboardText();
+
+#endif  // CHROME_BROWSER_COCOA_FIND_PASTEBOARD_H_