Support the OS X find pasteboard on OS X.

chrome/browser/renderer_host/resource_message_filter_mac.mm

Index: chrome/browser/renderer_host/resource_message_filter_mac.mm
diff --git a/chrome/browser/renderer_host/resource_message_filter_mac.mm b/chrome/browser/renderer_host/resource_message_filter_mac.mm
index b63c5bff4ea6cc657d528b627c7353783be891c0..f7687c923f5136c7915d620f9e9797f32b66a137 100644
--- a/chrome/browser/renderer_host/resource_message_filter_mac.mm
+++ b/chrome/browser/renderer_host/resource_message_filter_mac.mm
@@ -6,23 +6,36 @@
 
 #import <Cocoa/Cocoa.h>
 
+#include "base/message_loop.h"
 #include "base/sys_string_conversions.h"
+#import "chrome/browser/cocoa/find_pasteboard.h"
 
 // The number of utf16 code units that will be written to the find pasteboard,
 // longer texts are silently ignored. This is to prevent that a compromised
 // renderer can write unlimited amounts of data into the find pasteboard.
 static const size_t kMaxFindPboardStringLength = 4096;
 
+class WriteFindPboardTask : public Task {
+ public:
+  explicit WriteFindPboardTask(NSString* text)
+      : text_([text retain]) {}
+
+  void Run() {
+    [[FindPasteboard sharedInstance] setFindText:text_];
+  }
+
+ private:
+  scoped_nsobject<NSString> text_;
+};
+
 // Called on the IO thread.
 void ResourceMessageFilter::OnClipboardFindPboardWriteString(
     const string16& text) {
   if (text.length() <= kMaxFindPboardStringLength) {
     NSString* nsText = base::SysUTF16ToNSString(text);
     if (nsText) {
-      NSPasteboard* findPboard = [NSPasteboard pasteboardWithName:NSFindPboard];
-      [findPboard declareTypes:[NSArray arrayWithObject:NSStringPboardType]
-                         owner:nil];
-      [findPboard setString:nsText forType:NSStringPboardType];
+      // FindPasteboard must be used on the UI thread.
+      ui_loop()->PostTask(FROM_HERE, new WriteFindPboardTask(nsText));
     }
   }
 }