Move existing kSitePerProcess checks to a policy-oracle object

content/public/common/site_isolation_policy.cc

+// 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/public/common/site_isolation_policy.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 AreCrossProcessFramesPossible();
+}
+
+// static
+bool SiteIsolationPolicy::GuestsShouldUseCrossProcessFrames() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+// static
+void SiteIsolationPolicy::IsolateAllSitesForTesting(
+    base::CommandLine* command_line) {
+  command_line->AppendSwitch(switches::kSitePerProcess);
+}
+
+// static
+bool SiteIsolationPolicy::AreAllSitesIsolatedForTesting() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kSitePerProcess);
+}
+
+}  // namespace content