Add accessibility announcements when PageInfo subpages are opened

Bug: 1077766
Change-Id: I1b30c374cdc95632f42080cad20d121127abad42
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517439Reviewed-by: Ehimare Okoyomon <eokoyomon@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823936}

chrome/browser/ui/android/strings/android_chrome_strings.grd

@@ -3197,9 +3197,6 @@ Data from your Incognito session will only be cleared from Chrome when you <ph n
       <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_MENU_OS_VERSION_UNSUPPORTED" desc="Content description for the menu button when it is covered by the warning icon that is displayed when the current Android OS version is unsupported.">
         Chrome can’t update. More options
       </message>
-      <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_SITE_INFO" desc="Content description for the page icon that gives more site information when clicked. The icon can be a magnifier for search result pages, or other icons representing the page state.">
-        Site information
-      </message>
       <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_MIC" desc="Content description for the voice search button.">
         Start voice search
       </message>

components/browser_ui/strings/android/browser_ui_strings.grd

@@ -563,6 +563,9 @@
       <message name="IDS_COOKIES_TITLE" desc="Title for the Cookies settings screen [CHAR-LIMIT=32]">
           Cookies
       </message>
+      <message name="IDS_ACCESSIBILITY_TOOLBAR_BTN_SITE_INFO" desc="Content description for the page icon that gives more site information when clicked. The icon can be a magnifier for search result pages, or other icons representing the page state.">
+        Site information
+      </message>
 
       <!-- Media Capture and Streams -->
       <message name="IDS_MEDIA_CAPTURE_NOTIFICATION_APP_NAME_SEPARATOR" desc="A separator between the app name and notification message.">

components/browser_ui/strings/android/browser_ui_strings_grd/IDS_ACCESSIBILITY_TOOLBAR_BTN_SITE_INFO.png.sha1

+1e849f3b9392284f45e1b9aaf06c0c834089bb26
\ No newline at end of file

components/page_info/android/java/res/layout/page_info_container.xml

@@ -91,6 +91,7 @@
                 android:layout_marginStart="-12dp"
                 android:layout_marginEnd="20dp"
                 android:background="?attr/selectableItemBackgroundBorderless"
+                android:contentDescription="@string/back"
                 android:minWidth="@dimen/min_touch_target_size"
                 android:minHeight="@dimen/min_touch_target_size"
                 android:src="@drawable/ic_arrow_back_white_24dp"

components/page_info/android/java/src/org/chromium/components/page_info/PageInfoContainer.java

@@ -144,5 +144,8 @@ public class PageInfoContainer extends FrameLayout {
         mSubpageHeader.setVisibility(subPageTitle != null ? VISIBLE : GONE);
         mSubpageTitle.setText(subPageTitle);
         mContent.addView(view);
+        announceForAccessibility(subPageTitle != null
+                        ? subPageTitle
+                        : getResources().getString(R.string.accessibility_toolbar_btn_site_info));
     }
 }