[Mac]Implement ViewID support.

chrome/browser/cocoa/find_bar_view.mm

-// 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.
 
 #import "chrome/browser/cocoa/find_bar_view.h"
 
 #import "chrome/browser/cocoa/themed_window.h"
+#import "chrome/browser/cocoa/view_id_util.h"
 
 namespace {
 CGFloat kCurveSize = 8;
 }  // end namespace
 
 @implementation FindBarView
 
 - (void)drawRect:(NSRect)rect {
   // TODO(rohitrao): Make this prettier.
   rect = NSInsetRect([self bounds], 0.5, 0.5);
@@ skipping 86 matching lines @@
 }
 
 - (void)mouseDragged:(NSEvent *)theEvent {
 }
 
 - (void)rightMouseDragged:(NSEvent *)theEvent {
 }
 
 - (void)otherMouseDragged:(NSEvent *)theEvent {
 }
+
+// Tag is used solely for ViewID. Override to prevent changing of it.
+- (NSInteger)tag {
+  return view_id_util::ViewIDToTag(VIEW_ID_FIND_IN_PAGE);
+}
+
 @end