[Mac]Implement ViewID support. (third approach)

chrome/browser/cocoa/infobar_container_controller.mm

Index: chrome/browser/cocoa/infobar_container_controller.mm
diff --git a/chrome/browser/cocoa/infobar_container_controller.mm b/chrome/browser/cocoa/infobar_container_controller.mm
index 2f8b7514435dd7058a39fa24dd27ec1e10d674c1..374d9201430bf2808ea3c13eb4831e13d079f3b7 100644
--- a/chrome/browser/cocoa/infobar_container_controller.mm
+++ b/chrome/browser/cocoa/infobar_container_controller.mm
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -9,6 +9,7 @@
 #import "chrome/browser/cocoa/infobar_container_controller.h"
 #import "chrome/browser/cocoa/infobar_controller.h"
 #include "chrome/browser/cocoa/tab_strip_model_observer_bridge.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 #include "chrome/browser/tab_contents/infobar_delegate.h"
 #include "chrome/browser/tab_contents/tab_contents.h"
 #include "chrome/common/notification_service.h"
@@ -93,9 +94,16 @@ class InfoBarNotificationObserver : public NotificationObserver {
 
 - (void)dealloc {
   DCHECK([infobarControllers_ count] == 0);
+  view_id_util::UnsetID([self view]);
   [super dealloc];
 }
 
+- (void)awakeFromNib {
+  // The info bar container view is an ordinary NSView object, so we set its
+  // ViewID here.
+  view_id_util::SetID([self view], VIEW_ID_INFO_BAR_CONTAINER);
+}
+
 - (void)removeDelegate:(InfoBarDelegate*)delegate {
   DCHECK(currentTabContents_);
   currentTabContents_->RemoveInfoBar(delegate);