Enable PDF accessibility when RenderFrame's accessibility mode changes.

chrome/browser/printing/print_preview_dialog_controller_browsertest.cc

Index: chrome/browser/printing/print_preview_dialog_controller_browsertest.cc
diff --git a/chrome/browser/printing/print_preview_dialog_controller_browsertest.cc b/chrome/browser/printing/print_preview_dialog_controller_browsertest.cc
index d45a166f09f5c4f5f9231a77d04dbf8f48d50e60..e9ad66b36c03c9f85a6a79558a90cca49d67bbcb 100644
--- a/chrome/browser/printing/print_preview_dialog_controller_browsertest.cc
+++ b/chrome/browser/printing/print_preview_dialog_controller_browsertest.cc
@@ -26,6 +26,7 @@
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/printing/common/print_messages.h"
+#include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/plugin_service.h"
 #include "content/public/browser/render_frame_host.h"
 #include "content/public/browser/render_process_host.h"
@@ -381,6 +382,15 @@ IN_PROC_BROWSER_TEST_F(PrintPreviewDialogControllerBrowserTest,
                                base::CompareCase::INSENSITIVE_ASCII));
 }
 
+IN_PROC_BROWSER_TEST_F(PrintPreviewDialogControllerBrowserTest,
+                       PrintPreviewPdfAccessibility) {
+  content::BrowserAccessibilityState::GetInstance()->EnableAccessibility();
+  ui_test_utils::NavigateToURL(browser(), GURL("data:text/html,HelloWorld"));
+  PrintPreview();
+  WebContents* preview_dialog = GetPrintPreviewDialog();
+  WaitForAccessibilityTreeToContainNodeWithName(preview_dialog, "HelloWorld");
+}
+
 }  // namespace
 
 #endif  // defined(ENABLE_TASK_MANAGER)