[DevTools] Fix out of process iframes not working on chrome://inspect.

content/browser/devtools/site_per_process_devtools_browsertest.cc

Index: content/browser/devtools/site_per_process_devtools_browsertest.cc
diff --git a/content/browser/devtools/site_per_process_devtools_browsertest.cc b/content/browser/devtools/site_per_process_devtools_browsertest.cc
index 74f4adb82e322b83279c1bb33668c77ee2092ebf..c729ee5561e03a096105d1e6b88cbc8dd9ed8157 100644
--- a/content/browser/devtools/site_per_process_devtools_browsertest.cc
+++ b/content/browser/devtools/site_per_process_devtools_browsertest.cc
@@ -100,6 +100,9 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessDevToolsBrowserTest,
   EXPECT_EQ(main_url.spec(), list[0]->GetURL().spec());
   EXPECT_EQ(DevToolsAgentHost::kTypePage, list[1]->GetType());
   EXPECT_EQ(cross_site_url.spec(), list[1]->GetURL().spec());
+  EXPECT_EQ(std::string(), list[0]->GetParentId());
+  EXPECT_EQ(list[0]->GetId(), list[1]->GetParentId());
+  EXPECT_NE(list[1]->GetId(), list[0]->GetId());
 
   // Attaching to both agent hosts.
   scoped_refptr<DevToolsAgentHost> child_host = list[1];
@@ -167,6 +170,8 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessDevToolsBrowserTest, AgentHostForFrames) {
   child_frame_agent =
       DevToolsAgentHost::GetOrCreateFor(child->current_frame_host());
   EXPECT_NE(page_agent.get(), child_frame_agent.get());
+  EXPECT_EQ(child_frame_agent->GetParentId(), page_agent->GetId());
+  EXPECT_NE(child_frame_agent->GetId(), page_agent->GetId());
 }
 
 IN_PROC_BROWSER_TEST_F(SitePerProcessDevToolsBrowserTest,
@@ -194,6 +199,8 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessDevToolsBrowserTest,
   scoped_refptr<DevToolsAgentHost> main_frame_agent =
       DevToolsAgentHost::GetOrCreateFor(root->current_frame_host());
   EXPECT_NE(main_frame_agent.get(), child_frame_agent.get());
+  EXPECT_EQ(child_frame_agent->GetParentId(), main_frame_agent->GetId());
+  EXPECT_NE(child_frame_agent->GetId(), main_frame_agent->GetId());
 
   // Agent for web contents should be the the main frame's one.
   scoped_refptr<DevToolsAgentHost> page_agent =