Add a content_shell flag to turn on partial site isolation.

content/shell/common/shell_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/shell/common/shell_switches.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 
 namespace switches {
@@ skipping 34 matching lines @@
 // whether or not reloading a webpage releases web-related objects correctly.
 const char kEnableLeakDetection[] = "enable-leak-detection";
 
 // Encode binary layout test results (images, audio) using base64.
 const char kEncodeBinary[] = "encode-binary";
 
 // Exposes the window.internals object to JavaScript for interactive development
 // and debugging of layout tests that rely on it.
 const char kExposeInternalsForTesting[] = "expose-internals-for-testing";
 
+// Enable site isolation (--site-per-process style isolation) for a subset of
+// sites. The argument is a wildcard pattern which will be matched against the
+// site URL to determine which sites to isolate. This can be used to isolate
+// just one top-level domain, or just one scheme. Example usages:
+//     --isolate-sites-for-testing=*.com
+//     --isolate-sites-for-testing=https://*
+const char kIsolateSitesForTesting[] = "isolate-sites-for-testing";
+
 // Registers additional font files on Windows (for fonts outside the usual
 // %WINDIR%\Fonts location). Multiple files can be used by separating them
 // with a semicolon (;).
 const char kRegisterFontFiles[] = "register-font-files";
 
 // Request the render trees of pages to be dumped as text once they have
 // finished loading.
 const char kRunLayoutTest[] = "run-layout-test";
 
 // This makes us disable some web-platform runtime features so that we test
@@ skipping 11 matching lines @@
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kRegisterFontFiles)) {
     files = base::SplitString(
         command_line.GetSwitchValueASCII(switches::kRegisterFontFiles),
         ";", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
   }
   return files;
 }
 
 }  // namespace switches