Support the OS X find pasteboard on OS X.

chrome/browser/cocoa/find_pasteboard.mm

+// 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.
+
+#import "chrome/browser/cocoa/find_pasteboard.h"
+
+#include "base/logging.h"
+#include "base/sys_string_conversions.h"
+
+NSString* kFindPasteboardChangedNotification =
+    @"kFindPasteboardChangedNotification_Chrome";
+
+@implementation FindPasteboard
+
++ (FindPasteboard*)sharedInstance {
+  static FindPasteboard* instance = nil;
+  if (!instance) {
+    instance = [[FindPasteboard alloc] init];
+  }
+  return instance;
+}
+
+- (id)init {
+  if ((self = [super init])) {
+    findText_.reset([[NSString alloc] init]);
+
+    // Check if the text in the findboard has changed on app activate.
+    [[NSNotificationCenter defaultCenter]
+        addObserver:self
+           selector:@selector(loadTextFromPasteboard:)
+               name:NSApplicationDidBecomeActiveNotification
+             object:nil];
+    [self loadTextFromPasteboard:nil];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  // Since this is a singleton, this should only be executed in test code.
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+  [super dealloc];
+}
+
+- (NSPasteboard*)findPboard {
+  return [NSPasteboard pasteboardWithName:NSFindPboard];
+}
+
+- (void)loadTextFromPasteboard:(NSNotification*)notification {
+  NSPasteboard* findPboard = [self findPboard];
+  if ([[findPboard types] containsObject:NSStringPboardType])
+    [self setFindText:[findPboard stringForType:NSStringPboardType]];
+}
+
+- (NSString*)findText {
+  return findText_;
+}
+
+- (void)setFindText:(NSString*)newText {
+  DCHECK(newText);
+  if (!newText)
+    return;
+
+  DCHECK([NSThread isMainThread]);
+
+  BOOL needToSendNotification = ![findText_.get() isEqualToString:newText];
+  if (needToSendNotification) {
+    findText_.reset([newText copy]);
+    NSPasteboard* findPboard = [self findPboard];
+    [findPboard declareTypes:[NSArray arrayWithObject:NSStringPboardType]
+                       owner:nil];
+    [findPboard setString:findText_.get() forType:NSStringPboardType];
+    [[NSNotificationCenter defaultCenter]
+        postNotificationName:kFindPasteboardChangedNotification
+                      object:self];
+  }
+}
+
+@end
+
+string16 GetFindPboardText() {
+  return base::SysNSStringToUTF16([[FindPasteboard sharedInstance] findText]);
+}