Introduce support for origins that require process isolation.

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index 7b6135ce7a876b1dd5cea190b4056c68c68a2478..67f4931644309cb8a5fa6eea0682c135b9b9c35d 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -73,6 +73,7 @@
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/service_manager/service_manager_context.h"
+#include "content/browser/site_instance_impl.h"
 #include "content/browser/speech/speech_recognition_manager_impl.h"
 #include "content/browser/startup_task_runner.h"
 #include "content/browser/utility_process_host_impl.h"
@@ -628,6 +629,11 @@ void BrowserMainLoop::EarlyInitialization() {
     }
   }
 
+  if (parsed_command_line_.HasSwitch(switches::kIsolateOrigins)) {
+    SiteInstanceImpl::AddIsolatedOriginsFromCommandLine(
+        parsed_command_line_.GetSwitchValueASCII(switches::kIsolateOrigins));
+  }
+
   if (parts_)
     parts_->PostEarlyInitialization();
 }