SC Education: Fix dialog accessibility text

Add a new accessible string for the Arm 2 dialog title, so screen
readers can properly announce its contents.

Bug: b/315494131
Test: manual
Change-Id: I16dabc70e10d3fd07daacffc9d64f8f7e2aa8436
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5116032
Commit-Queue: Elijah Hewer <hewer@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1236652}
diff --git a/ash/ash_strings.grd b/ash/ash_strings.grd
index 2da472dc..f52097d 100644
--- a/ash/ash_strings.grd
+++ b/ash/ash_strings.grd
@@ -6163,6 +6163,9 @@
       <message name="IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_TITLE" desc="The title of the tutorial dialog for Screen Capture Education (Arm 2).">
         Press the screenshot shortcut
       </message>
+      <message name="IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_ACCESSIBLE_TITLE" desc="The accessible title of the tutorial dialog for Screen Capture Education (Arm 2).">
+        Press the screenshot shortcut, Ctrl plus Shift plus Overview mode key
+      </message>
       <message name="IDS_ASH_SCREEN_CAPTURE_EDUCATION_SETTINGS_NUDGE_LABEL" desc="The label of the Screen Capture Education settings nudge (Arm 3) for using the quick settings menu.">
         Use the screen capture tool in quick settings to take screenshots
       </message>
diff --git a/ash/ash_strings_grd/IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_ACCESSIBLE_TITLE.png.sha1 b/ash/ash_strings_grd/IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_ACCESSIBLE_TITLE.png.sha1
new file mode 100644
index 0000000..28606be
--- /dev/null
+++ b/ash/ash_strings_grd/IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_ACCESSIBLE_TITLE.png.sha1
@@ -0,0 +1 @@
+517e577881a719b45a6f7a0a0bb929a6bd99dba9
\ No newline at end of file
diff --git a/ash/capture_mode/capture_mode_education_controller.cc b/ash/capture_mode/capture_mode_education_controller.cc
index 30a1fb4f8..728d1e9 100644
--- a/ash/capture_mode/capture_mode_education_controller.cc
+++ b/ash/capture_mode/capture_mode_education_controller.cc
@@ -136,6 +136,8 @@
   auto dialog = std::make_unique<SystemDialogDelegateView>();
   dialog->SetTitleText(l10n_util::GetStringUTF16(
       IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_TITLE));
+  dialog->SetAccessibleTitle(l10n_util::GetStringUTF16(
+      IDS_ASH_SCREEN_CAPTURE_EDUCATION_TUTORIAL_ACCESSIBLE_TITLE));
   dialog->SetMiddleContentView(CreateContentView());
   dialog->SetMiddleContentAlignment(views::LayoutAlignment::kStretch);
   // Override the title margins to be zero, as the space between the title and