[iOS] Add string to trigger accessibility action for the chevron

This patch adds accessibility action string to trigger expand/collapse
in the search engine screen. The code will be added in a next CL.

screenshot:
https://drive.google.com/file/d/1LRSfVPesSCzWrBM1BCPcm7bbNHOPMotw/view?usp=drive_link&resourcekey=0-A16W3eEoEDoni9SrqfkBBA

Change-Id: I7e479fefbb461d215b199b09626642ce0449f970
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5084136
Commit-Queue: Menghan Yang <myuu@google.com>
Auto-Submit: Jérôme Lebel <jlebel@chromium.org>
Commit-Queue: Jérôme Lebel <jlebel@chromium.org>
Reviewed-by: Menghan Yang <myuu@google.com>
Cr-Commit-Position: refs/heads/main@{#1232794}
diff --git a/ios/chrome/app/strings/ios_strings.grd b/ios/chrome/app/strings/ios_strings.grd
index d4c05ab..114ae573 100644
--- a/ios/chrome/app/strings/ios_strings.grd
+++ b/ios/chrome/app/strings/ios_strings.grd
@@ -4329,6 +4329,12 @@
       <message name="IDS_IOS_WHATS_NEW_MINI_MAPS_SCREENSHOT_TEXT_OPEN_IN_APP" desc="Text in image displaying Open in App. [iOS only]">
         Open in App…
       </message>
+      <message name="IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_EXPAND_SNIPPET" desc="Accessibility action to expand the search engine description.">
+        Tap to expand
+      </message>
+      <message name="IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_COLLAPSE_SNIPPET" desc="Accessibility action to collapse the search engine description.">
+        Tap to collapse
+      </message>
       <message name="IDS_IOS_SIGN_IN_INVALID_ACCOUNT_MESSAGE" desc="Message of the alert displayed when the user sign in with a restricted account.">
         Your organization allows you to sign in only with certain accounts.
       </message>
diff --git a/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_COLLAPSE_SNIPPET.png.sha1 b/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_COLLAPSE_SNIPPET.png.sha1
new file mode 100644
index 0000000..bd855ffa
--- /dev/null
+++ b/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_COLLAPSE_SNIPPET.png.sha1
@@ -0,0 +1 @@
+5c448bc0d2d38379d788583c8acea12203cea006
\ No newline at end of file
diff --git a/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_EXPAND_SNIPPET.png.sha1 b/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_EXPAND_SNIPPET.png.sha1
new file mode 100644
index 0000000..bd855ffa
--- /dev/null
+++ b/ios/chrome/app/strings/ios_strings_grd/IDS_IOS_SEARCH_ENGINE_ACCESSIBILITY_EXPAND_SNIPPET.png.sha1
@@ -0,0 +1 @@
+5c448bc0d2d38379d788583c8acea12203cea006
\ No newline at end of file