Re-land (2): Fix loading accessibility tree for child frame that's already loaded.

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

Index: content/browser/accessibility/dump_accessibility_tree_browsertest.cc
diff --git a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
index 6f6f6afbe1a83c4ce0e094d627f253afbd3a60fc..d68e926238be0ffa10c358f449bf1c798800a426 100644
--- a/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
+++ b/content/browser/accessibility/dump_accessibility_tree_browsertest.cc
@@ -868,6 +868,12 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityFrameset) {
   RunHtmlTest(FILE_PATH_LITERAL("frameset.html"));
 }
 
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
+                       AccessibilityFramesetPostEnable) {
+  enable_accessibility_after_navigating_ = true;
+  RunHtmlTest(FILE_PATH_LITERAL("frameset.html"));
+}
+
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityHead) {
   RunHtmlTest(FILE_PATH_LITERAL("head.html"));
 }
@@ -902,6 +908,12 @@ IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest, AccessibilityIframe) {
 }
 
 IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
+                       AccessibilityIframePostEnable) {
+  enable_accessibility_after_navigating_ = true;
+  RunHtmlTest(FILE_PATH_LITERAL("iframe.html"));
+}
+
+IN_PROC_BROWSER_TEST_F(DumpAccessibilityTreeTest,
                        AccessibilityIframeCrossProcess) {
   RunHtmlTest(FILE_PATH_LITERAL("iframe-cross-process.html"));
 }