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

chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc

Index: chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc
diff --git a/chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc b/chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc
index efdba248733b87de8a2b9549a095f64c9f1d7cbb..1d064619c1066db6b4ef2a04e1afd82c32e07bb2 100644
--- a/chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc
+++ b/chrome/browser/task_manager/providers/web_contents/subframe_task_browsertest.cc
@@ -5,7 +5,6 @@
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
-#include "base/test/scoped_feature_list.h"
 #include "chrome/browser/task_manager/mock_web_contents_task_manager.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
@@ -205,8 +204,12 @@ class SubframeTaskTDIBrowserTest : public InProcessBrowserTest {
   SubframeTaskTDIBrowserTest() {}
   ~SubframeTaskTDIBrowserTest() override {}
 
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    InProcessBrowserTest::SetUpCommandLine(command_line);
+    content::EnableTopDocumentIsolationForTesting(command_line);
+  }
+
   void SetUpOnMainThread() override {
-    scoped_feature_list_.InitAndEnableFeature(features::kTopDocumentIsolation);
     host_resolver()->AddRule("*", "127.0.0.1");
     ASSERT_TRUE(embedded_test_server()->InitializeAndListen());
     content::SetupCrossSiteRedirector(embedded_test_server());
@@ -219,8 +222,6 @@ class SubframeTaskTDIBrowserTest : public InProcessBrowserTest {
   }
 
  private:
-  base::test::ScopedFeatureList scoped_feature_list_;
-
   DISALLOW_COPY_AND_ASSIGN(SubframeTaskTDIBrowserTest);
 };