Add seek forward/backward controls in MediaNotification

chrome/android/java/strings/android_chrome_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- android_chrome_strings.grd contains strings for Chrome for Android.
 
 FAQ:
   - How do I add, change, or remove a string?
       Just update this file.
   - Translations will happen automatically??
       Yes, indeed. Just add your string before the branch point and
       make the description good.
@@ skipping 1860 matching lines @@
         Warning
       </message>
 
       <!-- Messages for remote media playback (casting) -->
       <message name="IDS_CAST_CASTING_VIDEO" desc="AtHome text to tell user which screen casting is happening. [CHAR LIMIT=40]">
         Casting to <ph name="SCREEN_NAME">%1$s<ex>Living Room TV</ex></ph>
       </message>
       <message name="IDS_CAST_ERROR_PLAYING_VIDEO" desc="The message shown to the user when playing a video to the Chromecast fails.">
         Cannot play video on <ph name="SCREEN_NAME">%1$s<ex>Living Room TV</ex></ph>.
       </message>
-      <message name="IDS_ACCESSIBILITY_PLAY" desc="Content description for the play button that starts playing the media.">
+      <message name="IDS_ACCESSIBILITY_PLAY" desc="The play button that starts playing the media.">
         Play
       </message>
-      <message name="IDS_ACCESSIBILITY_PAUSE" desc="Content description for the pause button that pauses playing the media.">
+      <message name="IDS_ACCESSIBILITY_PAUSE" desc="The pause button that pauses playing the media.">
         Pause
       </message>
-      <message name="IDS_ACCESSIBILITY_STOP" desc="Content description for the stop button that stops playing the media.">
+      <message name="IDS_ACCESSIBILITY_STOP" desc="The stop button that stops playing the media.">
         Stop
       </message>
-      <message name="IDS_ACCESSIBILITY_PREVIOUS_TRACK" desc="Content description for the previous track button that switches media to the previous track.">
+      <message name="IDS_ACCESSIBILITY_PREVIOUS_TRACK" desc="The previous track button that switches media to the previous track.">
         Previous track
       </message>
-      <message name="IDS_ACCESSIBILITY_NEXT_TRACK" desc="Content description for the next track button that switches media to the next track.">
+      <message name="IDS_ACCESSIBILITY_NEXT_TRACK" desc="The next track button that switches media to the next track.">
         Next track
       </message>
+      <message name="IDS_ACCESSIBILITY_SEEK_FORWARD" desc="The seek forward button that seeks media to a later position.">
+        Seek forward
+      </message>
+      <message name="IDS_ACCESSIBILITY_SEEK_BACKWARD" desc="The seek backward button that seeks media to an earlier position.">
+        Seek backward
+      </message>
 
       <!-- New Tab Page strings -->
       <message name="IDS_NTP_BOOKMARKS" desc="Text for bookmarks button [CHAR-LIMIT=20]">
         Bookmarks
       </message>
       <message name="IDS_RECENT_TABS" desc="Text for button to show 'Recent tabs', i.e. recently closed tabs and tabs that are open on other devices [CHAR-LIMIT=20]">
         Recent tabs
       </message>
       <message name="IDS_MOST_VISITED_PLACEHOLDER_TITLE" desc="Header text shown on the new tab page when there are no most visited tiles yet.">
         Nothing to see here… yet
@@ skipping 840 matching lines @@
         Improved Add to Home screen Experiment
       </message>
 
       <message name="IDS_WEBAPK_UNKNOWN_SOURCES_DIALOG_MESSAGE" desc="Text of dialog warning user that installation from Unknown sources is required for WebAPK experiment">
         Turn on “Unknown sources” in Android security settings to try "Improved Add to Home screen" experiment. Be sure to disable this setting when you’re done trying it out.
       </message>
 
       <message name="IDS_WEBAPK_UNKNOWN_SOURCES_SETTINGS_BUTTON" desc="Button label for opening Android Settings from dialog warning user that installation from Unknown sources is required for WebAPK experiment.">
         Settings
       </message>
-      
+
       <!-- Keyboard shortcuts in Android N-->
       <message name="IDS_KEYBOARD_SHORTCUT_OPEN_NEW_TAB" desc="A text label that appears next to the keyboard shortcut to open a new tab in Chrome. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Open a new tab
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_REOPEN_NEW_TAB" desc="A text label that appears next to the keyboard shortcut for reopening the last tab in the chrome app. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Reopen the last closed tab
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_NEW_INCOGNITO_TAB" desc="A text label that appears next to a keyboard shortcut to open a new tab in incognito mode in Chrome. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Open a new tab in Incognito mode
       </message>
@@ skipping 25 matching lines @@
         Open the history page
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_PRINT_PAGE" desc="A text label that appears next to the keyboard shortcut that will open the print page. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Open options to print page
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_ZOOM_IN" desc="A text label that appears next to the keyboard shortcut that will increase everything on the page. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Make everything on the page bigger
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_ZOOM_OUT" desc="A text label that appears next to the keyboard shortcut that will decrease everything on the page. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Make everything on the page smaller
-      </message> 
+      </message>
       <message name="IDS_KEYBOARD_SHORTCUT_RESET_ZOOM" desc="A text label that appears next to the keyboard shortcut that will reset the zoom back to the original size. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Return everything on the page to default size
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_RELOAD_PAGE" desc="A text label that appears next to the keyboard shortcut that will reload the current page. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Reload the current page
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_RELOAD_NO_CACHE" desc="A text label that appears next to the keyboard shortcut that will reload the current page without a cache. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Reload the current page, ignoring cached content
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_HELP_CENTER" desc="A text label that appears next to the keyboard shortcut that will open the Google Chrome Help Center in a new tab. The shortcut description is shown in a system dialog along with all other supported shortcuts. [CHAR-LIMIT=50]">
         Open the Chrome Help Center in a new tab
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_TAB_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to the tab window. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Tab and window shortcuts
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_CHROME_FEATURE_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to the Chrome app features. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Google Chrome feature shortcuts
       </message>
       <message name="IDS_KEYBOARD_SHORTCUT_WEBPAGE_GROUP_HEADER" desc="A text label that appears above a list of shortcuts that are related to manipulation of the current tab window. This group is part of several groups of keyboard shortcuts all shown in a dialog.">
         Webpage shortcuts
-      </message> 
+      </message>
     </messages>
   </release>
 </grit>