Introduce support for origins that require process isolation.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index e1b50f9b43f6c41286382e32272ed96e56d1a1c0..36a7ed22b84d2dc89ca36548e940eeb1ce778d41 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -597,6 +597,11 @@ const char kInProcessGPU[]                  = "in-process-gpu";
 // connection from the browser before killing itself.
 const char kIPCConnectionTimeout[]          = "ipc-connection-timeout";
 
+// Enable process isolation for a set of origins, specified as a

[Charlie Reis, 2017/05/05 23:18:52]

s/Enable process isolation/Require dedicated processes/, perhaps?

[alexmos, 2017/05/16 17:26:38]

Done.

+// comma-separated list. For example:
+//   --isolate-origins=https://www.foo.com,https://www.bar.com
+const char kIsolateOrigins[] = "isolate-origins";
+
 // Chrome is running in Mash.
 const char kIsRunningInMash[] = "is-running-in-mash";