[DevTools] Expose DevToolsAgentHost for OOPIF, display it in chrome://inspect.

content/browser/devtools/site_per_process_devtools_browsertest.cc

+// Copyright (c) 2014 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/browser/frame_host/frame_tree.h"
+#include "content/browser/site_per_process_browsertest.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/devtools_agent_host.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "content/shell/browser/shell.h"
+#include "content/test/content_browser_test_utils_internal.h"
+#include "net/dns/mock_host_resolver.h"
+
+namespace content {
+
+class SitePerProcessDevToolsBrowserTest
+    : public SitePerProcessBrowserTest {
+ public:
+  SitePerProcessDevToolsBrowserTest() {}
+};
+
+class TestClient: public DevToolsAgentHostClient {
+ public:
+  TestClient() : closed_(false) {}
+  ~TestClient() override {}
+
+  bool closed() { return closed_; }
+
+  void DispatchProtocolMessage(
+      DevToolsAgentHost* agent_host,
+      const std::string& message) override {
+  }
+
+  void AgentHostClosed(
+      DevToolsAgentHost* agent_host,
+      bool replaced_with_another_client) override {
+    closed_ = true;
+  }
+
+ private:
+  bool closed_;
+};
+
+IN_PROC_BROWSER_TEST_F(SitePerProcessDevToolsBrowserTest,
+                       CrossSiteIframeAgentHost) {
+  DevToolsAgentHost::List list;
+  host_resolver()->AddRule("*", "127.0.0.1");
+  ASSERT_TRUE(test_server()->Start());
+  GURL main_url(test_server()->GetURL("files/site_per_process_main.html"));
+  NavigateToURL(shell(), main_url);
+
+  // It is safe to obtain the root frame tree node here, as it doesn't change.
+  FrameTreeNode* root =
+      static_cast<WebContentsImpl*>(shell()->web_contents())->
+          GetFrameTree()->root();
+
+  list = DevToolsAgentHost::GetOrCreateAll();
+  EXPECT_EQ(1U, list.size());
+  EXPECT_EQ(DevToolsAgentHost::TYPE_WEB_CONTENTS, list[0]->GetType());
+  EXPECT_EQ(main_url.spec(), list[0]->GetURL().spec());
+
+  // Load same-site page into iframe.
+  FrameTreeNode* child = root->child_at(0);
+  GURL http_url(test_server()->GetURL("files/title1.html"));
+  NavigateFrameToURL(child, http_url);
+
+  list = DevToolsAgentHost::GetOrCreateAll();
+  EXPECT_EQ(1U, list.size());
+  EXPECT_EQ(DevToolsAgentHost::TYPE_WEB_CONTENTS, list[0]->GetType());
+  EXPECT_EQ(main_url.spec(), list[0]->GetURL().spec());
+
+  // Load cross-site page into iframe.
+  GURL::Replacements replace_host;
+  GURL cross_site_url(test_server()->GetURL("files/title2.html"));
+  replace_host.SetHostStr("foo.com");
+  cross_site_url = cross_site_url.ReplaceComponents(replace_host);
+  NavigateFrameToURL(root->child_at(0), cross_site_url);
+
+  list = DevToolsAgentHost::GetOrCreateAll();
+  EXPECT_EQ(2U, list.size());
+  EXPECT_EQ(DevToolsAgentHost::TYPE_WEB_CONTENTS, list[0]->GetType());
+  EXPECT_EQ(main_url.spec(), list[0]->GetURL().spec());
+  EXPECT_EQ(DevToolsAgentHost::TYPE_FRAME, list[1]->GetType());
+  EXPECT_EQ(cross_site_url.spec(), list[1]->GetURL().spec());
+
+  // Attaching to child frame.
+  scoped_refptr<DevToolsAgentHost> child_host = list[1];
+  TestClient client;
+  child_host->AttachClient(&client);
+
+  // Load back same-site page into iframe.
+  NavigateFrameToURL(root->child_at(0), http_url);
+
+  list = DevToolsAgentHost::GetOrCreateAll();
+  EXPECT_EQ(1U, list.size());
+  EXPECT_EQ(DevToolsAgentHost::TYPE_WEB_CONTENTS, list[0]->GetType());
+  EXPECT_EQ(main_url.spec(), list[0]->GetURL().spec());
+  // TODO(dgozman): we should get closed notification here.
+  // See http://crbug.com/464993.
+  EXPECT_FALSE(client.closed());
+  child_host->DetachClient();
+  child_host = nullptr;
+}
+
+}  // namespace content