[sensors] Add Permission guard to the generic sensor apis.

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 578 matching lines @@
       </message>
       <message name="IDS_ENABLE_NOTIFICATIONS_VIBRATE_TITLE" desc="Title for the preference to enable vibration for notifications">
         Vibrate
       </message>
       <message name="IDS_ENABLE_NOTIFICATIONS_VIBRATE_SUMMARY" desc="Summary for the preference to enable vibration for notifications">
         Notifications may vibrate the device
       </message>
       <message name="IDS_MIDI_SYSEX_PERMISSION_TITLE" desc="Title of the permission that allows a website to get full control of MIDI devices [CHAR-LIMIT=32]">
         Allow full control of MIDI devices
       </message>
+      <!-- TODO(riju): Fix it -->
+      <message name="IDS_SENSORS_PERMISSION_TITLE" desc="Title of the permission that allows a website to get full control of sensors [CHAR-LIMIT=32]">
+        Allow full control of Sensors
+      </message>
       <message name="IDS_BACKGROUND_SYNC_PERMISSION_TITLE" desc="Title of the permission that allows websites to queue an operation for the next time the device is online[CHAR-LIMIT=32]">
         Background sync
       </message>
       <message name="IDS_WEBSITE_SETTINGS_ADD_SITE" desc="The label for the button to add a new website to the exception list.">
         Add site exception
       </message>
       <message name="IDS_WEBSITE_SETTINGS_ADD_SITE_DIALOG_TITLE" desc="The title of the dialog to add a website to a list.">
         Add site
       </message>
       <message name="IDS_WEBSITE_SETTINGS_ADD_SITE_ADD_BUTTON" desc="The label for the button to add a website to a list.">
@@ skipping 2140 matching lines @@
       <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>
     </messages>
   </release>
 </grit>