[mac] Let cmd-e write the selection into the find pasteboard.

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
new file mode 100644
index 0000000000000000000000000000000000000000..b63c5bff4ea6cc657d528b627c7353783be891c0
--- /dev/null
+++ b/chrome/browser/renderer_host/resource_message_filter_mac.mm
@@ -0,0 +1,28 @@
+// Copyright (c) 2006-2009 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.
+
+#include "chrome/browser/renderer_host/resource_message_filter.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/sys_string_conversions.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;
+
+// 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];
+    }
+  }
+}