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

content/browser/site_per_process_browsertest.cc

Index: content/browser/site_per_process_browsertest.cc
diff --git a/content/browser/site_per_process_browsertest.cc b/content/browser/site_per_process_browsertest.cc
index 30381e2f13cdade5a085c90d8ca6dc13d1512968..7140ce35c4b48b4a137d1b4a2aec06cd0cb28a95 100644
--- a/content/browser/site_per_process_browsertest.cc
+++ b/content/browser/site_per_process_browsertest.cc
@@ -4339,79 +4339,6 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, DocumentActiveElement) {
                                  grandchild->current_url().spec());
 }
 
-// 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.
-// Disabled due to flakes; see https://crbug.com/559273.
-IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, DISABLED_DocumentHasFocus) {
-  GURL main_url(embedded_test_server()->GetURL(
-      "a.com", "/cross_site_iframe_factory.html?a(b(c),d)"));
-  EXPECT_TRUE(NavigateToURL(shell(), main_url));
-
-  FrameTreeNode* root = static_cast<WebContentsImpl*>(shell()->web_contents())
-                            ->GetFrameTree()
-                            ->root();
-
-  EXPECT_EQ(
-      " Site A ------------ proxies for B C D\n"
-      "   |--Site B ------- proxies for A C D\n"
-      "   |    +--Site C -- proxies for A B D\n"
-      "   +--Site D ------- proxies for A B C\n"
-      "Where A = http://a.com/\n"
-      "      B = http://b.com/\n"
-      "      C = http://c.com/\n"
-      "      D = http://d.com/",
-      DepictFrameTree(root));
-
-  FrameTreeNode* child1 = root->child_at(0);
-  FrameTreeNode* child2 = root->child_at(1);
-  FrameTreeNode* grandchild = root->child_at(0)->child_at(0);
-
-  // Helper function to check document.hasFocus() for a given frame.
-  auto document_has_focus = [](FrameTreeNode* node) {
-    bool hasFocus = false;
-    EXPECT_TRUE(ExecuteScriptAndExtractBool(
-        node->current_frame_host(),
-        "window.domAutomationController.send(document.hasFocus())",
-        &hasFocus));
-    return hasFocus;
-  };
-
-  // The main frame should be focused to start with.
-  EXPECT_EQ(root, root->frame_tree()->GetFocusedFrame());
-
-  EXPECT_TRUE(document_has_focus(root));
-  EXPECT_FALSE(document_has_focus(child1));
-  EXPECT_FALSE(document_has_focus(grandchild));
-  EXPECT_FALSE(document_has_focus(child2));
-
-  FocusFrame(child1);
-  EXPECT_EQ(child1, root->frame_tree()->GetFocusedFrame());
-
-  EXPECT_TRUE(document_has_focus(root));
-  EXPECT_TRUE(document_has_focus(child1));
-  EXPECT_FALSE(document_has_focus(grandchild));
-  EXPECT_FALSE(document_has_focus(child2));
-
-  FocusFrame(grandchild);
-  EXPECT_EQ(grandchild, root->frame_tree()->GetFocusedFrame());
-
-  EXPECT_TRUE(document_has_focus(root));
-  EXPECT_TRUE(document_has_focus(child1));
-  EXPECT_TRUE(document_has_focus(grandchild));
-  EXPECT_FALSE(document_has_focus(child2));
-
-  FocusFrame(child2);
-  EXPECT_EQ(child2, root->frame_tree()->GetFocusedFrame());
-
-  EXPECT_TRUE(document_has_focus(root));
-  EXPECT_FALSE(document_has_focus(child1));
-  EXPECT_FALSE(document_has_focus(grandchild));
-  EXPECT_TRUE(document_has_focus(child2));
-}
-
 // Check that window.focus works for cross-process subframes.
 IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest, SubframeWindowFocus) {
   GURL main_url(embedded_test_server()->GetURL(