Move existing kSitePerProcess checks to a policy-oracle object

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index e1ddc2d258cd18e78165b110b6e794af4dd337d9..2cd42b5e71c8fe2f78cb79ceef434d0aac640dca 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -32,6 +32,7 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/content_switches.h"
 #include "content/public/test/test_utils.h"
 #include "net/base/filename_util.h"
 #include "net/cookies/cookie_store.h"
@@ -742,6 +743,15 @@ void RunTaskAndWaitForInterstitialDetach(content::WebContents* web_contents,
   loop_runner->Run();
 }
 
+bool AreAllSitesIsolatedForTesting() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+void IsolateAllSitesForTesting(base::CommandLine* command_line) {
+  command_line->AppendSwitch(switches::kSitePerProcess);
+}
+
 bool WaitForRenderFrameReady(RenderFrameHost* rfh) {
   if (!rfh)
     return false;