Move existing kSitePerProcess checks to a policy-oracle object

content/common/site_isolation_policy.cc

Index: content/common/site_isolation_policy.cc
diff --git a/content/common/site_isolation_policy.cc b/content/common/site_isolation_policy.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0aae9590ce06ac8b90d894ed8c1a3abf0e77caa0
--- /dev/null
+++ b/content/common/site_isolation_policy.cc
@@ -0,0 +1,30 @@
+// Copyright 2015 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 "content/common/site_isolation_policy.h"
+
+#include "base/command_line.h"
+#include "content/public/common/content_switches.h"
+
+namespace content {
+
+// static
+bool SiteIsolationPolicy::AreCrossProcessFramesPossible() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+// static
+bool SiteIsolationPolicy::DoesSiteRequireDedicatedProcess(const GURL& gurl) {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+// static
+bool SiteIsolationPolicy::UseSubframeNavigationEntries() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+}  // namespace content