[Mac]Implement ViewID support.

chrome/browser/cocoa/location_bar/autocomplete_text_field.mm

 // Copyright (c) 2010 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/location_bar/autocomplete_text_field.h"
 
 #include "base/logging.h"
 #import "chrome/browser/cocoa/browser_window_controller.h"
 #import "chrome/browser/cocoa/location_bar/autocomplete_text_field_cell.h"
 #import "chrome/browser/cocoa/location_bar/autocomplete_text_field_editor.h"
 #import "chrome/browser/cocoa/toolbar_controller.h"
 #import "chrome/browser/cocoa/url_drop_target.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 
 @implementation AutocompleteTextField
 
 @synthesize observer = observer_;
 
 + (Class)cellClass {
   return [AutocompleteTextFieldCell class];
 }
 
 - (void)dealloc {
@@ skipping 375 matching lines @@
 // (URLDropTarget protocol)
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
   return [dropHandler_ performDragOperation:sender];
 }
 
 - (NSMenu*)actionMenuForEvent:(NSEvent*)event {
   return [[self autocompleteTextFieldCell]
            actionMenuForEvent:event inRect:[self bounds] ofView:self];
 }
 
+// Tag is used solely for ViewID. Override to prevent changing of it.
+- (NSInteger)tag {
+  return view_id_util::ViewIDToTag(VIEW_ID_LOCATION_BAR);
+}
 @end