Create an interactive site-per-process browsertest class and move DocumentHasFocus there.

chrome/browser/site_per_process_interactive_browsertest.cc

+// Copyright 2016 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 "base/command_line.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/content_browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "net/dns/mock_host_resolver.h"
+#include "net/test/embedded_test_server/embedded_test_server.h"
+#include "url/gurl.h"
+
+class SitePerProcessInteractiveBrowserTest : public InProcessBrowserTest {
+ public:
+  SitePerProcessInteractiveBrowserTest() {}
+  ~SitePerProcessInteractiveBrowserTest() override {}
+
+  void SetUpCommandLine(base::CommandLine* command_line) override {
+    content::IsolateAllSitesForTesting(command_line);
+  }
+
+  void SetUpOnMainThread() override {
+    host_resolver()->AddRule("*", "127.0.0.1");
+
+    // Add content/test/data for cross_site_iframe_factory.html
+    embedded_test_server()->ServeFilesFromSourceDirectory("content/test/data");
+
+    ASSERT_TRUE(embedded_test_server()->Start());
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SitePerProcessInteractiveBrowserTest);
+};
+
+// Check that document.hasFocus() works properly with out-of-process iframes.
+// The test builds a page with four cross-site frames and then focuses them one
+// by one, checking the value of document.hasFocus() in all frames.  For any
+// given focused frame, document.hasFocus() should return true for that frame
+// and all its ancestor frames.
+IN_PROC_BROWSER_TEST_F(SitePerProcessInteractiveBrowserTest, DocumentHasFocus) {
+  GURL main_url(embedded_test_server()->GetURL(
+      "a.com", "/cross_site_iframe_factory.html?a(b(c),d)"));
+  ui_test_utils::NavigateToURL(browser(), main_url);
+
+  content::WebContents* web_contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+
+  content::RenderFrameHost* main_frame = web_contents->GetMainFrame();
+  content::RenderFrameHost* child1 = ChildFrameAt(main_frame, 0);
+  ASSERT_NE(nullptr, child1);
+  content::RenderFrameHost* child2 = ChildFrameAt(main_frame, 1);
+  ASSERT_NE(nullptr, child2);
+  content::RenderFrameHost* grandchild = ChildFrameAt(child1, 0);
+  ASSERT_NE(nullptr, grandchild);
+
+  EXPECT_NE(main_frame->GetSiteInstance(), child1->GetSiteInstance());
+  EXPECT_NE(main_frame->GetSiteInstance(), child2->GetSiteInstance());
+  EXPECT_NE(child1->GetSiteInstance(), grandchild->GetSiteInstance());

[alexmos, 2016/04/05 16:16:56]

Note that the old test used DepictFrameTree, which isn't available in chrome/. 
I replaced that with these checks, which is all the test really cares about.

[nasko, 2016/04/08 18:29:20]

We could make DepictFrameTree content/ public test method, which takes
WebContents as input. Might be a good idea, I'd suggest pinging nick@ about it.

[alexmos, 2016/04/11 18:37:29]

Will do.   I'll go ahead without it here, and if we decide to do it, I'll update
this in a separate CL.

+
+  // Helper function to check document.hasFocus() for a given frame.
+  auto document_has_focus = [](content::RenderFrameHost* rfh) {
+    bool hasFocus = false;
+    EXPECT_TRUE(ExecuteScriptAndExtractBool(
+        rfh,
+        "window.domAutomationController.send(document.hasFocus())",
+        &hasFocus));
+    return hasFocus;
+  };
+
+  // The main frame should be focused to start with.
+  EXPECT_EQ(main_frame, web_contents->GetFocusedFrame());
+
+  EXPECT_TRUE(document_has_focus(main_frame));
+  EXPECT_FALSE(document_has_focus(child1));
+  EXPECT_FALSE(document_has_focus(grandchild));
+  EXPECT_FALSE(document_has_focus(child2));
+
+  EXPECT_TRUE(ExecuteScript(child1, "window.focus();"));
+  EXPECT_EQ(child1, web_contents->GetFocusedFrame());
+
+  EXPECT_TRUE(document_has_focus(main_frame));
+  EXPECT_TRUE(document_has_focus(child1));
+  EXPECT_FALSE(document_has_focus(grandchild));
+  EXPECT_FALSE(document_has_focus(child2));
+
+  EXPECT_TRUE(ExecuteScript(grandchild, "window.focus();"));
+  EXPECT_EQ(grandchild, web_contents->GetFocusedFrame());
+
+  EXPECT_TRUE(document_has_focus(main_frame));
+  EXPECT_TRUE(document_has_focus(child1));
+  EXPECT_TRUE(document_has_focus(grandchild));
+  EXPECT_FALSE(document_has_focus(child2));
+
+  EXPECT_TRUE(ExecuteScript(child2, "window.focus();"));
+  EXPECT_EQ(child2, web_contents->GetFocusedFrame());
+
+  EXPECT_TRUE(document_has_focus(main_frame));
+  EXPECT_FALSE(document_has_focus(child1));
+  EXPECT_FALSE(document_has_focus(grandchild));
+  EXPECT_TRUE(document_has_focus(child2));
+}
+