Whitelisting exts and plugins from cross-site document blocking

chrome/renderer/chrome_content_renderer_client.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 "chrome/renderer/chrome_content_renderer_client.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/path_service.h"
@@ skipping 1287 matching lines @@
   }
 #endif  // !defined(OS_ANDROID)
   return false;
 }
 
 bool ChromeContentRendererClient::ShouldReportDetailedMessageForSource(
     const base::string16& source) const {
   return extensions::IsSourceFromAnExtension(source);
 }
 
+bool ChromeContentRendererClient::ShouldEnableSiteIsolationPolicy() const {
+  // SiteIsolationPolicy is off by default. We would like to activate cross-site
+  // document blocking (for UMA data collection) for normal renderer processes
+  // running a normal web page from the Internet. We only turn on
+  // SiteIsolationPolicy for a renderer process that does not have the extension
+  // flag on.
+  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  return !command_line->HasSwitch(switches::kExtensionProcess);
+}
+
 }  // namespace chrome