[Mac] Expose AutocompleteEditViewMac to Cocoa code.

chrome/browser/cocoa/autocomplete_text_field_unittest_helper.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/autocomplete_text_field_unittest_helper.h"
+
+#import "chrome/browser/cocoa/autocomplete_text_field.h"
+#import "chrome/browser/cocoa/autocomplete_text_field_editor.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+@implementation AutocompleteTextFieldWindowTestDelegate
+
+- (id)windowWillReturnFieldEditor:(NSWindow *)sender toObject:(id)anObject {
+  EXPECT_TRUE([anObject isKindOfClass:[AutocompleteTextField class]]);
+
+  if (editor_ == nil) {
+    editor_.reset([[AutocompleteTextFieldEditor alloc] init]);
+  }
+  EXPECT_TRUE(editor_ != nil);
+
+  // This needs to be called every time, otherwise notifications
+  // aren't sent correctly.
+  [editor_ setFieldEditor:YES];
+  return editor_;
+}
+
+@end