Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

chrome/browser/ui/extensions/hosted_app_browsertest.cc

Index: chrome/browser/ui/extensions/hosted_app_browsertest.cc
diff --git a/chrome/browser/ui/extensions/hosted_app_browsertest.cc b/chrome/browser/ui/extensions/hosted_app_browsertest.cc
index 15ae43e01347c820136d9ae475ebbda6ef102714..e5ae235b8d9916983a8d40f1bfe65eecca585ed4 100644
--- a/chrome/browser/ui/extensions/hosted_app_browsertest.cc
+++ b/chrome/browser/ui/extensions/hosted_app_browsertest.cc
@@ -255,15 +255,17 @@ class HostedAppVsTdiTest : public HostedAppTest {
   HostedAppVsTdiTest() {}
   ~HostedAppVsTdiTest() override {}
 
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    HostedAppTest::SetUpCommandLine(command_line);
+    content::EnableTopDocumentIsolationForTesting(command_line);
+  }
+
   void SetUpOnMainThread() override {
-    scoped_feature_list_.InitAndEnableFeature(features::kTopDocumentIsolation);
     HostedAppTest::SetUpOnMainThread();
     ASSERT_TRUE(embedded_test_server()->Start());
   }
 
  private:
-  base::test::ScopedFeatureList scoped_feature_list_;
-
   DISALLOW_COPY_AND_ASSIGN(HostedAppVsTdiTest);
 };