[Mac]Implement ViewID support.

chrome/browser/cocoa/extensions/browser_actions_container_view.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/extensions/browser_actions_container_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #import "base/scoped_nsobject.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 
 NSString* const kBrowserActionGrippyDragStartedNotification =
     @"BrowserActionGrippyDragStartedNotification";
 NSString* const kBrowserActionGrippyDraggingNotification =
     @"BrowserActionGrippyDraggingNotification";
 NSString* const kBrowserActionGrippyDragFinishedNotification =
     @"BrowserActionGrippyDragFinishedNotification";
 
 namespace {
 const CGFloat kAnimationDuration = 0.2;
@@ skipping 176 matching lines @@
   } else if (!canDragLeft_) {
     retVal = [NSCursor resizeRightCursor];
   } else if (!canDragRight_) {
     retVal = [NSCursor resizeLeftCursor];
   } else {
     retVal = [NSCursor resizeLeftRightCursor];
   }
   return retVal;
 }
 
+// Tag is used solely for ViewID. Override to prevent changing of it.
+- (NSInteger)tag {
+  return view_id_util::ViewIDToTag(VIEW_ID_BROWSER_ACTION_TOOLBAR);
+}
+
 @end