Whitelisting exts and plugins from cross-site document blocking

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index ef9c3fc04d9a306ee5b4af59a4784042814afd79..7f4bfe242cfb23406a98e1f18063aad9f4542d68 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -1305,4 +1305,14 @@ bool ChromeContentRendererClient::ShouldReportDetailedMessageForSource(
   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