[Mac]Implement ViewID support.

chrome/browser/cocoa/tab_controller_unittest.mm

Index: chrome/browser/cocoa/tab_controller_unittest.mm
diff --git a/chrome/browser/cocoa/tab_controller_unittest.mm b/chrome/browser/cocoa/tab_controller_unittest.mm
index 16f527c2393b18107b7228eaf734fc36ec5ba257..b4b685ccbb9435813f21d5616c058e358f47abec 100644
--- a/chrome/browser/cocoa/tab_controller_unittest.mm
+++ b/chrome/browser/cocoa/tab_controller_unittest.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.
 
@@ -57,6 +57,12 @@
            forController:(TabController*)controller {
   return NO;
 }
+- (NSInteger)indexForTabController:(TabController*)controller
+                           inTotal:(NSInteger*)total {
+  if (total)
+    *total = 1;
+  return 0;
+}
 @end
 
 namespace {