Clarify wording around blocking 3rd party cookies and add lab to block reading of 3rd party cookies

chrome/common/chrome_switches.cc

 // 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 
 namespace switches {
@@ skipping 69 matching lines @@
 const char kAuthSchemes[]                   = "auth-schemes";
 
 // Whitelist of servers which NTLM and Negotiate can automatically authenticate
 // with using the default credentials of the currently logged in user.
 const char kAuthServerWhitelist[] = "auth-server-whitelist";
 
 // The value of this switch tells the app to listen for and broadcast
 // automation-related messages on IPC channel with the given ID.
 const char kAutomationClientChannelID[]     = "automation-channel";
 
+// When the option to block third-party cookies from being set is enabled,
+// also block third-party cookies from being read.
+const char kBlockReadingThirdPartyCookies[] =
+    "block-reading-third-party-cookies";
+
 // Causes the browser process to throw an assertion on startup.
 const char kBrowserAssertTest[]             = "assert-test";
 
 // Causes the browser process to crash on startup.
 const char kBrowserCrashTest[]              = "crash-test";
 
 // Path to the exe to run for the renderer and plugin subprocesses.
 const char kBrowserSubprocessPath[]         = "browser-subprocess-path";
 
 // How often (in seconds) to check for updates. Should only be used for
@@ skipping 1272 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR CRAP TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead,
 // please put them in alphabetical order above, or in order inside the
 // appropriate ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches