Introduce support for origins that require process isolation.

content/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/common/site_isolation_policy.h"
 
 #include "base/command_line.h"
 #include "base/feature_list.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 
 namespace content {
 
 // static
 bool SiteIsolationPolicy::AreCrossProcessFramesPossible() {
 // Before turning this on for Android, input event routing needs to be
 // completed there, and perf regressions in https://crbug.com/690229 need to be
 // investigated.
 #if defined(OS_ANDROID)
   return UseDedicatedProcessesForAllSites() ||
-         IsTopDocumentIsolationEnabled() ||
+         IsTopDocumentIsolationEnabled() || AreIsolatedOriginsEnabled() ||
          GetContentClient()->IsSupplementarySiteIsolationModeEnabled() ||
          base::FeatureList::IsEnabled(::features::kGuestViewCrossProcessFrames);
 #else
   return true;
 #endif
 }
 
 // static
 bool SiteIsolationPolicy::UseDedicatedProcessesForAllSites() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSitePerProcess);
 }
 
 // static
 bool SiteIsolationPolicy::IsTopDocumentIsolationEnabled() {
   // --site-per-process trumps --top-document-isolation.
   if (UseDedicatedProcessesForAllSites())
     return false;
 
   return base::FeatureList::IsEnabled(::features::kTopDocumentIsolation);
 }
 
+// static
+bool SiteIsolationPolicy::AreIsolatedOriginsEnabled() {
+  // TODO(alexmos): This currently assumes that isolated origins are only added
+  // via the command-line switch, which may not be true in the future.  Remove
+  // this function when AreCrossProcessFramesPossible becomes true on Android
+  // above.
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kIsolateOrigins);
+}
+
 }  // namespace content