[content shell] allow universal access from file URLs in layout tests

content/public/common/content_switches.cc

 // Copyright (c) 2012 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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
 const char kAllowFileAccessFromFiles[]      = "allow-file-access-from-files";
 
+// Explicitely grant the ability to access every other SecurityOrigin to
+// file URLs. This is a security havoc and should only be used for testing.
+const char kAllowUniversalAccessFromFiles[] =
+    "allow-universal-access-from-files";
+
 // Allows debugging of sandboxed processes (see zygote_main_linux.cc).
 const char kAllowSandboxDebugging[]         = "allow-sandbox-debugging";
 
 // Allow compositing on chrome:// pages.
 const char kAllowWebUICompositing[]         = "allow-webui-compositing";
 
 // Enumerates and prints a child process' most dangerous handles when it
 // is terminated.
 const char kAuditHandles[]                  = "enable-handle-auditing";
 
@@ skipping 714 matching lines @@
 // Sets the width and height above which a composited layer will get tiled.
 const char kMaxUntiledLayerWidth[]          = "max-untiled-layer-width";
 const char kMaxUntiledLayerHeight[]         = "max-untiled-layer-height";
 
 const char kEnableFixedPositionCreatesStackingContext[]
     = "enable-fixed-position-creates-stacking-context";
 const char kDisableFixedPositionCreatesStackingContext[]
     = "disable-fixed-position-creates-stacking-context";
 
 }  // namespace switches